(Reuters) - Eight retired Chilean military officers were sentenced to 15 years in prison on Tuesday for the murder of popular folk singer Victor Jara during the 1973 coup that installed late dictator Augusto Pinochet in power.

FILE PHOTO: A couple pays homage to late Chilean musician Victor Jara during the "Velaton" (candle-lit vigil) outside the National Stadium in Santiago, September 12. REUTERS

A judge handed down the sentences after leading a long-running inquiry into Jara’s death on Sept. 16, 45 years ago, a statement from Chile’s courts authority said.

Miguel Vázquez sentenced the eight men to 15 years and one day in prison for the murder of Jara and that of former prisons director Littre Quiroga Carvajal.

A ninth suspect was jailed for five years for his role in covering up the killings.

Jara, 40, was a celebrated singer, theater director and university professor who sympathized with the socialist government of Salvador Allende, who was ousted in the 1973 coup.

Jara’s work, and the nature of his death, inspired tributes from artists including Bruce Springsteen, the Clash and U2.

He was detained along with his students, fellow academics and scores of other leftists in a Chilean soccer stadium that has since been named after him.

According to detainees in the stadium who survived, Jara’s hands were smashed with the butt of a gun and he was badly beaten during his incarceration. When his body was found three days after his disappearance near a cemetery, it was found riddled with 44 bullet holes.

His family, including British-born ballerina wife Joan and his daughter Amanda, has fought a long-running campaign for justice in his case and had his body exhumed in 2009 for a full autopsy.

In 2016, another former military official, retired army lieutenant Pedro Barrientos, was found liable by a federal civil court jury in Florida, for torturing and killing Jara.

Barrientos, who lives in Florida but whose extradition to Chile is currently under U.S. consideration, was also ordered to pay $28 million in damages to Jara’s family.

The case against Barrientos was filed by the U.S.-based Center for Justice and Accountability, a human rights advocacy group, on behalf of Jara’s widow, his daughter and step-daughter.

During Pinochet’s rule, which lasted until 1990, an estimated 3,200 people were killed and 28,000 tortured by the state.