'Make sure the guys go win this game': San Francisco 49ers backup QB C.J. Beathard's last message to teammates upon learning his brother, 22, was fatally stabbed

The brother of NFL backup quarterback C.J. Beathard was fatally stabbed, along with another man outside a Nashville bar around 3am on Saturday
Clayton Beathard, 22, was stabbed along with Paul Trapeni III, 21, outside Dogwood Bar following an alleged argument over a woman inside the bar
Clayton played football at Long Island University in New York City
Police released surveillance footage of three men and a woman at the bar they want to bring in for questioning
Beathard left the 49ers on Saturday in the wake of the stabbing, missing a game
He told head coach Kyle Shanahan: 'You make sure the guys go win this game'

Hours after San Francisco 49ers backup quarterback C.J. Beathard learned his younger brother was fatally stabbed, he left town to be with his family and was forced to miss a game Saturday night.

But before he left, the football star gave his head coach Kyle Shanahan one last message: 'You make sure the guys go win this game.'

Clayton Beathard, 22, was stabbed along with Paul Trapeni III, 21, on Saturday shortly before 3am outside The Dogwood Bar in Nashville, Tennessee following an alleged argument over a woman.

On Sunday the San Francisco 49ers shared touching video of Coach Shanahan's heartbreaking speech in the locker room after the team beat the Los Angeles Rams 34-31.

'I didn't know what to say to you guys at the beginning of this day because you guys know what happened last night. Having to go spend an hour with C.J. last night... you guys know how tough this is for him and his family right now,' Shanahan said, his voice quivering with emotion.

'He barely could talk and the last thing he said to me before I walked out the door, he stops me and goes, make sure the guys go win this game.'

49ers coach gives emotional tribute to team after killing of Beathard's brother

Hours after San Francisco 49ers backup quarterback C.J. Beathard learned his brother was fatally stabbed on Saturday he left town and was forced to miss a game. Before leaving he told his coach: 'Make sure the guys go win this game'

Clayton Beathard (left) - the 22-year-old brother of the San Francisco 49ers backup quarterback C.J. Beathard - was fatally stabbed outside a Nashville bar early Saturday morning. Paul Trapeni III, 21, (right) was also killed in the altercation

'I didn't want to say that at the beginning of the game because this game doesn't mean anything compared to his brother, we all know that. But you guys also know C.J., he's got our backs and we've got his,' Coach Shanahan continued.

'It was a special day for us, guys. And I'm so thankful for you guys that you could do that for him. Cause that was the last thing he said to me and I know that still meant a lot to him,' he added.

In the clip the camera captures the downcast and emotional faces of Beathard's teammates, mourning the loss of their teammates' brother.

'It was definitely the toughest game of my career,' tight end George Kittle said. He and Beathard played at the University of Iowa together. 'Today was absolutely terrible, for me the entire day. It sucked all around. Overall it was just kind of a brutal day. We got that one for C.J. and I'm so happy we were able to do it.'

A manhunt is now underway in Tennessee for the stabbing assailant. Nashville Police released surveillance footage of three men and a woman they want to bring in for questioning.

The stabbings 'appear to have resulted from an argument over a woman that began inside Dogwood Bar and then turned physical when the parties went outside,' police say.

On Sunday the San Francisco 49ers shared touching video of Coach Shanahan's heartbreaking speech in the locker room after the team beat the Los Angeles Rams 34-31 on Saturday night

'I didn't know what to say to you guys at the beginning of this day because you guys know what happened last night. Having to go spend an hour with C.J. last night, you guys know how tough this is for him and his family right now,' Shanahan said in his emotional speech

'He barely could talk and the last thing he said to me before I walked out the door, he stops me and goes, make sure the guys go win this game,' Shanahan said to his players

Metro police were called to the bar on Division Street just before 3am. In the altercation a total of three men were stabbed.

Police say multiple people were involved in the outdoor fight.

Clayton and Paul Trapeni were stabbed in their sides and both taken to Vanderbilt Medical Center where they were pronounced dead, police said in a statement.

The third victim, 21, suffered injuries to his eye and arm and is still in the hospital, according to News Channel 5.

Cops are now looking for three men and a woman pictured in surveillance footage taken from the bar.