(AP) — Omaha’s police chief says a man accused of killing his girlfriend spoke to a police detective just hours earlier.

19-year-old Mikael Loyd called Omaha homicide detective Teresa Negron on Aug. 14 after he was released from an Omaha mental health assessment center. Loyd had been held at the center for several days after police questioned his mental stability.

News of the call comes after police said Wednesday that the center’s staff did not alert police of Loyd’s release. Police are trying to determine why Loyd wasn’t arrested immediately after his release on a warrant accusing him of assaulting his girlfriend.

Police have said Loyd killed 19-year-old Melissa Rodriguez hours after his release and dumped her body in a freshly dug cemetery grave.