I DIDN’T MAKE a special project of analyzing Walt’s behaviors and thinking patterns; I didn’t have to.

Over the two weeks after the church outing, more and more negative aspects of his personality came to light. I would later learn these characteristics were often representative of psychopathic traits. If Walt had kept to himself, I might never have interacted enough with him to have formed any opinion of his character, but because he was a gregarious sort, he liked to talk and did so almost every time he saw me. Worrisome mannerisms and behaviors kept appearing.

Walt liked telling stories about incredible things that had happened to him.

“I actually left the military early,” he told me one day as he was getting himself a bowl of Cheerios.

“Really? Why? What happened?”

“Well, I was in Grenada for the operation the United States conducted down there.” He poured milk on the cereal.

Grenada? I could hardly remember the conflict.

“It was wrong, us invading them. So I asked to leave the air force and they let me go.” He made it sound like such cooperation by the military was a regular occurrence. Walt gazed past me as if he wasn’t expecting a response.

“They just let you go?” I asked. “I didn’t think they let anyone go just because they decided military life wasn’t a joy ride.”

Walt acted as though I hadn’t commented and he changed the subject.

“They just hired some new girl to work in our mail room. She’s pretty cute.”

The next day he stepped into the kitchen while I was preparing dinner and offered a new explanation for his separation from the air force.

“Actually, I left the military because I had to shoot a bunch of the Grenadians and it really depressed me. I don’t like violence.” I raised an eyebrow, but he abruptly turned and left before I could ask questions again. I found his stated dislike of violence rather ironic considering he was obsessed with Arnold Schwarzenegger movies and watched The Running Man again and again during the short time he lived in my house. He liked to pretend to be Arnold as well.

“I’ll be back!” he would announce, striking a pose, hands on his hips and head turned sideways.

A week later, he had a new ending to the story.

“I got shot in the leg and that’s why the air force released me,” he told me. He seemed to be searching for an explanation that I would actually believe.

“Oh, I see,” I said, and I didn’t push for further information. My acceptance of this version seemed to end his need to talk to me about his short military career.

Though Walt professed a desire to avoid violence, he appeared to have problems with violence finding him. One night, he told me that he was attacked on the way home by a knife-wielding stranger who stabbed him in the thigh. He claimed he had been jumped while walking down the bike path that ran the two miles between Kim’s house and mine-he carpooled with her from work to her place and then covered the remainder of the route home on foot. Walt told me he had already sewn up the cut himself. I glanced down at his upper leg but he was wearing jeans that covered the “damaged” area. I saw no rip in the cloth and wondered about the veracity of this story, which didn’t quite ring true.

“Why did he attack you?” I asked, skeptical.

He shrugged. “I don’t know.” Then he went back to his room.

A few days later, Walt claimed he had been assaulted again, this time by a homeless man at a bus shelter. He said he was forced to punch the man. By the end of the week, another tale: he subdued a man who wanted to fight him in a bar. I commented rather dryly that my husband had never experienced all this criminal behavior; that Walt, at five eleven and 220 pounds, should have been less of a target for assault than Tony, who had the smaller build of a West Indian soccer player.

THERE WERE OTHER odd stories. On my only visit to Walt’s room since he moved in, I noticed a framed photograph of a lovely young girl displayed on his nightstand. She wore a black graduation gown and a gold chain with a cross hung around her neck. Clearly, the photo was a high school yearbook picture.

“Who’s the pretty girl?” I asked.

Walt sighed.

“She was my high school love, Tiffany. We were going to get married, but on prom night, while I was waiting for her to show up at the dance, she got into a traffic accident. Her car was hit by a truck and she got decapitated.”

He looked at me sadly; then he added, “That’s why I haven’t had sex since.”

After quickly picturing the headless girl in my mind, my next thought was that this man had not had sex since he was seventeen years old. I counted the years, seven of them. And he had been a military man, albeit for a short period of time. I found the likelihood of this self-imposed celibacy hard to swallow, especially since I had come to realize he was not particularly religious (in spite of his recent church attendance) and he talked often about how women were always coming on to him, calling them “sluts,” “bitches,” and “whores.” He even commented that a number of women he had gone out with weren’t interested in sex with him because they were closet lesbians.

He had other peculiarities. The all-black clothing Walt had changed into while at the amusement park had become his regular uniform. When he came home from work, he would morph into his “costume” and disappear out of the house for hours, returning home long after dark. He relished stalking about at night pretending he was a ninja.

“I’m the Avenger!” he informed me, clearly envisioning himself as an invincible gladiator, some superhero straight out of the comic books he loved. I soon discovered he knew nothing of karate outside of making “HA!” noises and striking a stance with bent knees, a fist, and a knife hand. He was like a child who never grew up.

It was during the third week of his stay in my home that Kim told me she was considering breaking off her romantic relationship with Walt.

“He’s beginning to really creep me out,” she confided. “He makes people at work uncomfortable with his bizarre behavior and his ridiculous stories, which none of us think are true. He avoids doing work and makes excuses for not getting tasks accomplished. He usually blames someone else for his poor work performance. Some of the women think he’s stalking them.” She reached into her pocketbook, pulled out a ring with some kind of jewel in it, and shoved it at me. “He told me he bought this to celebrate our one-month anniversary and that it cost him over a thousand dollars! Supposedly he has to make payments on the ring for the next six months!” She grimaced. “I was mortified that he had spent so much money on a present for me when we had been dating only a few weeks. I tried to refuse to accept it, but Walt acted all insulted and insisted I take it. As soon as he left, I began thinking that maybe he was lying about the cost of the ring, that it was really a piece of costume jewelry.”

I looked at the ring, but I was no expert. Save my engagement and wedding rings, I never wore any jewelry in those days.

Kim continued. “I took the ring to a store to get it appraised. The jeweler told me it was definitely not real and probably worth about fifty dollars.” She shook her head. “I have to get away from him. I am going to tell him I don’t want to continue dating when I see him on Saturday.”

As she left the house, she turned and apologized to me. “Sorry I pushed you into renting to him.”

I told her not to worry. Everything would work out just fine.

Little did I know how my life would change.

That night, after tucking in the children, I lay in bed with Tony, staring up at the ceiling in the dark. I felt pretty much like Kim and her coworkers.

“Tony,” I said, “we need to give Walt notice on the first of July. I don’t think I want this guy in our house any longer than he needs to be here.”