His Facebook page lists "shooting" as one of his 10 interests, along with camping, sleeping, rafting, BMX, sushi and spending money.
Roberts told Curry that his mother died at childbirth and he never met his father, she said. He left his maternal aunt's home at age 14, Curry said.
"He raised himself," Curry said. "He was doing it all on his own."
A friend from high school, Jordan Salazar, said she understood that Roberts' parents were not present in his life. He was a skateboarder back then, she said.
"In high school Jake was a nice guy, outgoing," Salazar told CNN.
"I saw him a few times in the last year. He seemed normal" and a "good guy," she added.
Roberts valued his friends, Curry said.
Roberts wrote on his Facebook page: "My friends are my family and I don't think that will ever change. I have done a lot for myself in the past year some good and some bad but I still press on.
"I like hanging out with my friends and having a good time maybe get a little drunk every now and then. I like to think of myself as a bit of an adrenaline junkie... Yup that's right I'm a junkie lol. But I'm just looking to meet new people and see the world," Roberts typed.
When they were dating, Roberts was living in an apartment across from the Clackamas Town Center mall, Curry said.