"As for the ex-boyfriend:
“Well, obviously, we have people that are under the umbrella of interest and he is one of them, but we do not have him arrested or detained,” Troyer said. “He’s somebody that we need to track the evidence until it tells us that he’s involved, or the evidence tells us he’s not at fault. But at this point, it wouldn’t be prudent for us not to continue looking at him as a possibility in this case.”
Troyer says it is not clear whether the ex-boyfriend could be the father of Cantrell’s unborn baby, or who the father might be.
“We are working this case as if something nefarious happened, we’re working this as a homicide until something tells us different because this is not normal for her,” Troyer said. “She lives with her parents, she stays in touch with friends, so it was immediately suspicious when she went missing and didn’t make it to a doctor’s appointment.”
“When we found her car abandoned down by the railroad tracks and by the Sounder train, and with keys inside, then we knew we were on the right path, and so we’re continuing to work this until the evidence tells us something different, as a possible homicide,” he added."
Missing Parkland woman treated as homicide investigation, ex-boyfriend is person of interest
I hadn't read that her keys were found in her car.