By David Perel - Executive Vice President/Managing Editor Radar

Pro football player Jovan Belcher murdered the mother of his child and tenderly bent down, kissed her on the forehead and apologized.

READ: Police Report From Murder Scene

That is one of the shocking and sickening new details that have emerged since the Kansas City Chief’s murder-suicide early December 1, an act with tremors felt far beyond the world of sports.

Significant new details are emerging from theBelcher case, Breaking Celebrity News is reporting, including:

• Belcher was drunk and with another woman, just hours before the tragedy.
• The linebacker was hit in the head several times during an NFL game, raising questions about his ability to think clearly if he suffered from a concussion.
• He was mixing alcohol and prescription pills immediately before committing the murder suicide.

Before shooting Kasandra Perkins, 22, with his mother in the house, Belcher, 25 said to his girlfriend, “You can’t talk to me like that,” reports the Kansas City Star.

After shooting Perkins nine times, Belcher bent over, kissed her on the forehead and said her was