CARROLLTON, GEORGIA: A sacked college professor has pleaded guilty to fatally shooting a student sitting in a parked vehicle. He was sentenced on Monday, October 30, for fatally shooting Anna Lynn Jones.

Prosecutors in Carroll County, Georgia, said that the defendant, Richard Sigman, 49, had no prior connection to Lynn Jones. They explained that the crime happened “randomly and inexplicably.”

Sigman, who was fired from the University of West Georgia because of the incident, pleaded guilty to malice murder, three counts of aggravated assault, and three counts of possession of a firearm during commission of a felony.

How long will Richard Sigman spend in prison?

The defendant was ordered to serve a life sentence plus 55 years and will be eligible for parole after 30 years behind bars.

Prosecutors note that means that Sigman, who was 47 at the time of the murder, will be 77 before he has a chance at freedom.

According to authorities, on July 30 last year, Sigman became extremely drunk and got into an argument with a man at Leopoldo’s Pizza Napoletana, a bar and restaurant.

He threatened to shoot this person, so security, seeing the defendant armed, kicked him out, they said. A lawsuit from Jones’ mother described Sigman as “a belligerent drunk who liked to pick fights with others.”

Authorities do not know why Richard Sigman killed Anna Lynn Jones

“For reasons that are not clear from the evidence, shortly after midnight, Sigman stumbled into the lower level of the courthouse parking deck, drew his firearm, and walked up to the parked vehicle occupied by the three female victims, all of whom were college students,” the authorities wrote, according to Law and Crime.

“Sigman approached the passenger side of the vehicle and banged on the window while brandishing his handgun. The victims were naturally terrified and began to back out of the parking space to escape from Sigman. As they reversed out of the parking space, Sigman fired three rounds, striking the front seat passenger in the head and killing her," the authorities further stated.

Richard Sigman claimed that he fired in self-defense

Jones had graduated from the local Mount Zion High School and was days from starting classes at UWG. Law enforcement responded, finding Sigman on the ground of the parking lot next to his gun.

According to authorities, he claimed to have fired in self-defense after someone shot at him, but security footage contradicted his story.

“His actions were legally unjustified, senseless, and incomprehensible,” said prosecutors. Neither Sigman nor the girls had seen each other before or had any connection.