Officer Randolph Holder the fourth NYPD cop shot, killed in recent months

Officer Randolph Holder is the fourth NYPD officer to be shot and killed while on the job within the last year.

The 33-year-old Holder, who was shot in the forehead on Oct. 21 while attempting to catch an armed robber, died at around 10:22 p.m. in Harlem Hospital. His shooter,identified as Tyrone Howard, was left with gunshot wounds to his legs and remained in police custody.

Holder was on the job for five years, joining the force in 2010. He is survived by his father, who served as a police officer in their native Guyana.

Police apprehended three other men other than the suspected shooter, all of whom were being questioned by investigators on Wednesday.

Officer Brian Moore, 25, died on May 4 after he was shot in the head days earlier while on patrol with his partner in Queens. Moore was on patrol in an unmarked car on the evening of May 2 when they noticed suspect Demetrius Blackwell adjust his waistband at around 6:15 p.m. When the officers tried to approach him, Blackwell fired his gun into the police car at least twice.

Moore, the son of an NYPD officer, served five years with the department. In July, Queens Village residents said they would rename the intersection of 222nd Street and 92nd Road after Moore.

Blackwell, who was caught by police 90 minutes after the shooting,was indicted for murder in June. He remains in custody without bail.

Officers Wenjian Liu, 32, and Rafael Ramos, 40, were killed on Dec. 20 by a gunman as the two cops sat in their patrol car in Bed-Stuy. Investigator said that their shooter, Ismaaiyl Brinsley, drove to Brooklyn from Baltimore and used social media to announce he would shoot police moments before he killed Liu and Ramos.

Liu served seven years on the job and was survived by his wife, whom he was married to for less than three months before his death.

Ramos, who joined the NYPD following years working as a school safety agent, was only with NYPD for three years. He left a wife and two sons behind.

Brinsley killed himself following his attack on Ramos and Liu after attempting to escape from the scene and running into a nearby subway station.

While four officers have been shot and killed, others have passed away or been attacked while on duty in recent years.

Officer Dennis Guerradied from complications after escaping from a blaze in a Coney Island apartment buildingwith his partner in April 2014. His partner Officer Rosa Rodriguez survived after weeks of medical attention. The teenager accused of setting the fire was charged with second-degree murder.

Four Queens cops survived an October 2014 attack from a hatchet-weilding man, including rookie Officer Kenneth Healey — who bore the brunt of a swipe of the weapon to his head and hand. The attacker was shot and killed immediately after the assault.

In January 2015, two police officers were shot — Officer Aliro Pellerano in the elbow and Officer Andrew Dossi in the back —while responding to a robbery in the Bronx. Both survived the shootout, and investigators tracked down two suspects who were arrested for the shooting and robbery.