According to legal docs, obtained by TMZ, Gabriel Hall was arrested in October for the murder of Carlos Veliz Jr. in Abilene, Texas. Cops say Hall and Veliz were involved in some sort of verbal argument around 1:30 AM on August 31 ... and it ended with Gabriel shooting Veliz in the head, killing him.

Cops say they connected Hall to the crime with the help of surveillance footage in the area that linked a car he was renting to the scene. They also say they found a spent shell casing in the vehicle as well as evidence of gunshot residue on Hall's hands and clothing.

Ivan finished third as a contestant on Tayshia's season, and his relationship with Gabriel was a plot point on the show. During one episode, Gabriel surprised both Tayshia and Ivan when he joined them on the hometown date episode.

Ivan had previously shared with Tayshia that he helps raise Gabriel's 6-year-old daughter because Gabriel was regularly in trouble with the law.

Hall has been charged with murder, possession of a firearm by a felon, possession of methamphetamines and a slew of other counts.