Aaron Jansen, Holder's lawyer, told reporters on Wednesday that his client, 32, lost consciousness after being attacked Tuesday morning in a jail holding cell, causing a one-day delay in trial.
Holder later underwent an MRI and required three staples to the back of his head.
"[He] was attacked by two inmates and beaten," Jansen told Rolling Stone following the incident. "He was cut with a razor in the back of his head and received three staples. His face is swollen, and his eye is swollen."
On Wednesday morning, Holder was back in court and Jansen said, "He was obviously in some pain yesterday. He's OK to go forward."
Hussle — whose real name is Ermias Asghedom — was fatally shot outside his clothing store in L.A. on March 31, 2019. Two other men were also injured during the shooting.
Holder has been charged with murder and attempted murder.
Deputy District Attorney John McKinney said during his opening statement that there's "no doubt" Holder knew in advance that he would kill Hussle.
McKinney said Holder and Hussle knew each other and were members of the same gang, the Rollin' 60s, claiming Holder was jealous of Hussle's success, which Jansen disputed.
On the other hand, Jansen said his client was upset because Hussle had accused him of being a snitch.
Jansen admitted Holder committed the killing during his opening statement, but he argued his client should be convicted of voluntary manslaughter instead of murder, claiming Hussle's comments about snitching left Holder "so enraged and triggered" that he opened fire.
"Crimes like this, the enormity of these crimes, is that they can't be contained … there are a lot of unnamed victims in this," McKinney said in his closing arguments on Thursday. "The bullets land either in a person or they hit a wall. They stop. But in a figurative sense these bullets are still traveling. This neighborhood has not forgotten."