A teenager was killed and a man was seriously injured in separate shootings in Chula Vista Friday night and early Saturday, and another man was injured Friday night in a shooting near a south San Diego trolley stop, authorities said.

The homicide and the trolley shooting may be related, authorities said.

The fatal shooting occurred on Woodlawn Avenue near G Street. Chula Vista police Lt. Dan Linney said the victim had reportedly just stepped out of a car when the gunman walked up and fired a shotgun at close range. The gunman escaped in a small, dark four-door sedan.

The victim was identified Saturday as Jose Luiz Rodriguez, 17, of National City. Rodriguez lived with his parents and was a full-time student at San Diego City College, authorities said.

Linney said the gunman may have been involved in a drive-by shooting a few minutes earlier near the Palm Avenue trolley station in the Palm City neighborhood of south San Diego.

As Chula Vista police were investigating the homicide, a 26-year-old man was injured in a drive-by shooting about 12:30 a.m. Saturday outside the Over the Border nightclub on Main Street near Fourth Avenue. The man had just left the club and and was walking through the parking lot talking on a cell phone when a vehicle with two people inside drove by and the passenger fired, witnesses said.

Linney said the gunman wore a mask and gloves and used a shotgun. The vehicle was described as a dark 1990s Jeep Cherokee with tinted windows and a roof rack.

The victim, who was not identified, suffered a life-threatening wound, police said.

In the south San Diego incident, witnesses called police about 11:50 p.m. Friday to report a shooting near the trolley station in the 2300 block of Palm Avenue. Police said two men in a small, dark four-door sedan drove by and onefired a shotgun at the victim, who was hit in the side with birdshot pellets.

– Pauline Repard and Kristina Davis