The brother of ex-NFL star Aqib Talib, Yaqub Talib, has pleaded guilty to murder ... stemming from his role in the shooting of a youth football coach last summer.
A rep for the Dallas County District Attorney's Office tells TMZ Sports ... Yaqub entered the plea this week -- agreeing to be sentenced to 37 years in prison.
Formal sentencing for the 40-year-old has been slated for August 7, the rep said.
Yaqub was initially accused of pulling out a firearm and shooting Michael Hickmon following an argument at an Aug.