Police spokesman Darin Snapp confirmed it was Belcher, a fourth-year player from West Babylon, N.Y., who played college ball at Maine. The woman's name has not yet been released.
Snapp said Belcher shot the woman at a Kansas City residence, then drove to the Chiefs facility. He thanked Chiefs general manager Scott Pioli and Romeo Crennel for all they had done for him, then shot himself.
The Chiefs say Sunday's home game against the Carolina Panthers will go on as scheduled.
