The Latest on the killing of a college professor linked to a bitter divorce (all times local):

3:50 p.m.

Florida police say they plan to charge a second man in the slaying of a well-known Florida State University law professor.

Tallahassee Police Chief Michael DeLeo said at a news conference that Luis Rivera is a suspect in Daniel Markel's homicide.

Rivera has not been charged, but he is already in a federal prison for an unrelated crime. In court records released Thursday, police say both Rivera and Sigfredo Garcia came to Tallahassee from South Florida and killed Markel in July 2014. An attorney for Garcia says his client will plead not guilty to murder charges. Garcia was arrested last week in Hallandale Beach, in South Florida.

DeLeo said Markel's killing appears to be a murder-for-hire scheme because neither Rivera nor Garcia had a connection to Markel.

The police chief also called the relationship between Markel and his ex-wife Wendi Adelson a "motivating factor" in Markel's killing.

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9:07 a.m.

According to newly released court records, investigators say the killing of a Florida State University law professor was part of a murder-for-hire scheme.

Sigfredo Garcia was arrested in South Florida last week in connection to the July 2014 death of Daniel Markel. Garcia made a brief appearance in court Thursday and his lawyer says he'll plead not guilty.

But court records show a second man was also involved in Markel's death.

The arrest affidavit also says the killing "stemmed from the desperate desire" of Markel's ex-wife's family to have Wendi Adelson and the couple's two children move to South Florida. It does not, however, say who hired the killers.

Markel was shot in the head inside his Tallahassee garage during the middle of the day.