A second suspect was taken into custody today in connection to the February shooting death of a Signal Hill resident near Poly High School, authorities said.

Long Beach resident Jalen Jackson, 19, was arrested and booked on suspicion of murder following an investigation that led detectives to believe he was involved in the slaying of 31-year-old Nashon Wall on Feb. 2.

Police said Wall was sitting in his car in the 700 block of East Esther Street sometime between 6 and 6:30 p.m. when multiple men approached him. At least one of the men produced a handgun and fired at Wall, authorities said.

When police arrived at the area around 6:34 p.m., officers located an unresponsive Wall lying in the roadway next to his vehicle, the LBPD said at the time of the shooting. Despite life-saving measures by Long Beach Fire personnel and being treated at a hospital for his injuries, Wall was pronounced dead shortly after.

Police worked into the night to find the suspects, who were said to have fled into a nearby complex after the shooting, prompting a SWAT team to respond and serve a search warrant. Police were able to locate firearms evidence at the apartment complex that night, but no suspects, according to the LBPD.

“Detectives are still actively working to determine the motive for this incident, and the investigation remains ongoing,” said the Long Beach Police Department in a news release. “Detectives will continue their efforts to ensure anyone else who participated in this crime is brought to justice.

In March, a warrant was issued for Jackson’s alleged co-conspirator, 20-year-old Anaheim resident Saeed Wheeler. Wheeler was arrested for involvement in an unrelated incident by the Los Angeles County Sheriff’s Department but one count each of murder, possession of a firearm by a felon and unlawful possession of ammunition were added to his charges. He has pleaded not guilty.

Detectives expect to present the case against Jackson to the Los Angeles County District Attorney’s office for filing consideration later this week, according to the LBPD. His bail was set at $2 million.

UPDATE: Deadly shooting near Poly High sparks SWAT search, police say