The Bristol County state attorney's office spent nearly half a million dollars on the prosecution of onetime NFL star Aaron Hernandez.

The 25-year-old former New England Patriots tight end was found guilty of first-degree murder earlier this year in the June 2013 execution-style killing of Odin Lloyd. Hernandez has since been sentenced to life in prison without the possibility of parole.

According to the Boston Herald, at the time of the slaying, Lloyd was dating the sister of Hernandez's fiancee and the motive for his murder remains convoluted. Just prior to being taken into custody, Hernandez had inked a $40 million extension with the Patriots.

The newspaper breaks down the monies spent by prosecutors as $360,462.30 on overtime for state police and $101,834.64 for expenses such as experts and travel. Those figures don't include what the office spent for salaried employees who also labored long and hard on the case.

In all, the trial lasted more than 90 days when factoring in jury election and deliberations. In addition, three prosecutors and several other county staffers were assigned to the case for the entire court room proceedings.

"It would be impossible to quantify man hours of prosecutors and staff," Bristol County spokesperson Gregg Miliote wrote in an email. He admitted the amount also does not account for the work of local police departments or the county sheriff's office.

Meanwhile, attorneys for Hernandez have indicated they plan to appeal the verdict, meaning that prosecutors might not be done with all the excessive spending.

Hernandez also still faces double murder charges stemming from a 2012 drive-by shooting in downtown Boston. Hernandez is accused of gunning down two men after an encounter inside a nightclub where one of them spilled a drink on him and failed to apologize.

Hernandez has pleaded not guilty in the case.