A man who was shot in the stomach at a south Palo Alto parking lot early Tuesday morning has died, police said. A $20,000 reward is being offered for information related to the shooting.

He has been identified as 52-year-old Armando Montelongo Espinoza of San Jose, according to the Santa Clara County Medical Examiner-Coroner's Office. His cause of death is pending.

The shooting occurred at about 3 a.m. in the 700 block of San Antonio Road, near the Mountain View city line. The victim was shot once in the stomach, according to the Palo Alto Police Department. He was conscious and breathing when police arrived.

Paramedics from the Palo Alto Fire Department treated the man and transported him to a local hospital, where he underwent surgery but ultimately died from his injuries, police said on Tuesday afternoon.

Police are actively investigating the shooting as a homicide and said they have no motive for the case or suspect information to release at this point.

Due to the seriousness of the crime, police said, Los Altos nonprofit Mothers Against Murder is offering a $20,000 reward for information leading to the arrest of the suspect or suspects.

Police closed eastbound San Antonio Road between Leghorn Street and East Charleston Road as they investigated the shooting and collected evidence on Tuesday morning. They are also looking for surveillance video in the area.

The Santa Clara County Office of the Medical Examiner-Coroner did not release the victim's identity on Tuesday afternoon, stating that the coroner had not yet positively identified him.

Anyone with information about this incident is asked to call the police department's 24-hour dispatch center at 650-329-2413. Anonymous tips can be e-mailed to paloalto@tipnow.org or sent via text message or voicemail to 650-383-8984. Tips can also be submitted anonymously through the department’s free mobile app, downloadable at bit.ly/PAPD-AppStore or bit.ly/PAPD-GooglePlay.