Tragic news ... former NFL defensive lineman Du'Vonta Lampkin has died after he was shot on Thursday.
He was just 25 years old.
According to the Dallas Police Department, Lampkin was found "lying on his back with a single gunshot wound" by officers at a rented residence at around 10:10 p.m. in Dallas.
Cops say they had been called to the scene after a witness said Lampkin had stopped answering phone calls.
Police say medical personnel arrived a short time after officers discovered Lampkin ... but said the ex-football player couldn't be saved and died on the scene.