Police looking into the disappearance of 33-year-old pregnant woman Kassanndra Cantrell say they’re now investigating it as a homicide case. The announcement comes after police executed a search warrant on the Tacoma, Washington, home of Cantrell’s ex-boyfriend and called in a forensic team, KING5 reported. “We had the FBI involved because this is a very intricate case, and they have some equipment, and some materials, and some processes that we don’t have that are highly advanced, and we are going to need them on this case,” Pierce County Sheriff’s Detective Ed Troyer told My Northwest. Cantrell vanished a week ago after leaving home, one day before she was scheduled to have her first sonogram. Her car was later found abandoned. “She is still missing under highly suspicious circumstances,” Troyer said.