FALL RIVER, Mass. (Reuters) - A Massachusetts jury on Friday began its fourth day of deliberations over whether former National Football League star Aaron Hernandez murdered an associate in an industrial park near his home in 2013.

Hernandez, 25, a former tight end for the New England Patriots, faces a charge of murder and two firearms-related violations in the shooting death of semiprofessional football player Odin Lloyd.

If convicted of first-degree murder, he would be sentenced to life in prison without the possibility of parole. A second-degree murder conviction would lead to a life sentence with the possibility of parole after 15 years.

The murder trial is the first of two Hernandez faces this year. After the jury in Fall River, Massachusetts, delivers a verdict in the Lloyd killing, Hernandez will face trial in Boston on charges of fatally shooting two Cape Verdean men outside a nightclub in 2012.

On Thursday, the judge overseeing Hernandez's case barred a local television cameraman from covering the proceedings after he drove a truck that followed a bus full of jurors, saying the incident could have led to a mistrial.

(Reporting by Richard Valdmanis; Editing by Bernadette Baum)