Gretna — A Bridge City teenager already accused of killing an 81-year-old woman admitted to chasing and killing a 58-year-old man just a few days earlier, according to the Jefferson Parish Sheriff’s Office.

Authorities booked Isaac Smith, 19, with second-degree murder after deputies said he fatally shot Doretha Richardson at her Bridge City home Feb. 15, Sheriff’s Office spokesman Glen Boyd said in a news release. Richardson died after Smith fired a barrage of bullets at her home where her grandson, a 3-year-old girl and another woman also were present, according to an arrest report.

Investigators booked Smith on Wednesday with a second murder charge after they say he admitted to fatally shooting Emeal Washington on Feb. 11 in the victim’s old Marrero neighborhood, according to an arrest report.

According to the report, while questioning Smith about the Richardson incident, the man voluntarily admitted to Washington’s slaying. Washington was found dead near a vehicle in the 6100 block of August Lane. At the time, a witness told investigators that several men walked up on Washington, chased him and then gunned him down while he was visiting a friend, according to the arrest report.

The shooters in that incident unloaded at least 81 rounds from three different weapons based on the shell casings police recovered from the scene. The home that Washington was visiting was pockmarked with bullet holes, similar to the façade of Richardson’s home.

According to the arrest report, Smith said that he and three other men walked up on Washington while the man was outside getting cigarettes from his car. The gunmen opened fire on Washington, and he tried to flee, according the report. Smith told investigators he and the others chased Washington, firing as they ran, until he collapsed in the front yard of the home. Smith told investigators he and the others then stood over Washington and pumped bullets into his body as he lay on the ground, according to the report.

Investigators were aided in solving the crime by a surveillance video from a nearby home that showed the shooting and the men standing over the victim. The report states that Smith told investigators he was one of the men in the video after viewing the recording.

At the time of the shooting, there was some question about whether Washington was the target of the shooting or just a bystander. Col. John Fortunato, a sheriff’s spokesman, has maintained that Washington was the target. No motive has been released in Washington’s shooting, although he did have a prior history involving narcotics, Fortunato said.

It is still not clear if Richardson was the intended target in her killing. Investigators were initially looking for Richardson’s grandson for questioning immediately after the shooting because the young man disappeared. Fortunato previously said that both Richardson and Washington were well-known to law enforcement officers before their deaths.