UPDATE: Fourth suspect arrested in brutal beating death of Tucson man

TUCSON, Ariz. (KOLD News 13) - A fourth person has been arrested in connection with the brutal beating death of a Tucson man in June.

The Tucson Police Department said Christopher Hart, 37, was found in the parking lot at Eastpointe Market Place, located near 22nd and Kolb, on June 22. Hart suffered blunt-force trauma and died at a local hospital.

On Sept. 7, the TPD arrested 34-year-old Luis Manuel Salas on a charge of first-degree murder. He is being held on a $1 million bond. The arrest was not announced until Sunday, Sept. 11.

On Aug. 13, the TPD arrested three men -- Miguel Francisco Rodriguez, 39, Aaron Fernando Montiel, 47, and Miguel Cipriano Lara-Cabazos, 27. All three are facing first-degree murder charges and being held on $1 million bonds.

Miguel Cipriano Lara-Cabazos, Aaron Fernando Montiel and Miguel Francisco Rodriguez.(Tucson Police Department)

According to the TPD, Hart got into an argument with a group of men. A short time later, more men arrived and began assaulting Hart and one of his friends before they fled the scene.