KANSAS CITY, Mo. (AP) — As investigators search for a motive to help explain why Chiefs linebacker Jovan Belcher killed his girlfriend and then himself, a discordant picture of the couple began to emerge.

Belcher and his girlfriend, 22-year-old Kasandra M. Perkins, had lived apart briefly earlier in the year but had gotten back together by Thanksgiving, according to a friend of Perkins.

Brianne York, 21, said Sunday the couple, who had a 3-month-old daughter, Zoey, argued about "normal couple stuff" but that her friend was "really happy about being a mom."