A 40-year-old father of four’s killing Saturday in San Francisco’s Bayview brought back painful memories for his family, who suffered a similar tragedy 14 years ago when his younger sister, Annie, was killed at a party by a bullet to the back at the age of 23.

Gabriel Powell was shot to death Saturday during a vigil for his friend who was killed by gunfire in nearly the exact same spot less than 24 hours earlier.

He was identified Tuesday as the victim of the fatal shooting that occurred Saturday just before 8:10 p.m. near the intersection of La Salle Avenue and Newhall Street, according to the San Francisco medical examiner. A 27-year-old man, who was not identified, was also injured in the shooting and transported to the hospital with non-life-threatening injuries, police said.

“I’m hopeful that they will catch this person, because we have yet to receive justice for my sister’s murder,” said Kechette Walls, Powell’s other sister. “I just hope that whoever did this either comes forward or someone tells. This is extremely difficult for my family right now.”

Powell had gone to a house to pay his respects Saturday night after his friend had been shot and killed at the same intersection 18 hours earlier, Walls said.

At about 2:20 a.m., 24-year-old Allan Cortez-Segura was fatally shot at La Salle Avenue and Newhall Street, according to the medical examiner. A 21-year-old man, who was not identified, was also shot and remains in critical condition, police said.

No arrests have been made in either deadly shooting, and police are investigating whether they are connected, said Officer Joseph Tomlinson, a San Francisco police spokesman.

Powell “wasn’t involved in any gangs or anything like that,” said Edward Powell, the victim’s father. “He was just a working father.”

Born and raised in San Francisco, Powell worked as a painter in the city.

Family members remembered him on Tuesday as a loving father of three girls — ages 18, 11 and 10 — and a 9-year-old boy. At the end of February, Powell’s fiancee, La’Rina White, is due to deliver their baby boy.

“Gabe was very loving and a very family-oriented person,” Walls said through tears. “We were very, very close, a tight-knit family. His kids meant the world to him.”

Powell often took his children to the park to teach them to play basketball and football, or play games at a Dave and Buster’s arcade. Over the Christmas holiday, Powell took his children to an ice-skating rink.

“He would always be the protector no matter what was going on,” Walls said. “Whatever you needed, he was always there. It didn’t matter what time.”

Powell would often brag about having “better skills” at putting his sister’s baby girl back to sleep when she woke up too early from a nap, she said. Walls’ daughter is now 21 years old. The day he died, Powell hosted a goodbye lunch at P.F. Chang’s in Emeryville before his niece returned to college in Charlotte, N.C.

“He was telling my daughter this Saturday that she was like his first daughter and she prepared him for his daughters,” Walls said. “I just thank God that we were all able to come together and spend Saturday together.”

Sarah Ravani is a San Francisco Chronicle staff writer. Email: sravani@sfchronicle.com Twitter: @SarRavani