Relatives of 30-year-old Brian Bole, a scientist killed over the weekend near his Oakland home, are trying to make sense of the slaying. The motive and perpetrator are not known.

Shortly after midnight Saturday, Bole was making his way home from a bar when he was fatally shot on the 3000 block of Richmond Boulevard near 30th Street, police said. His phone and wallet were still on him when detectives arrived, said Officer Marco Marquez, a police spokesman, but investigators are not ruling out a robbery attempt.

He had moved to the city last year and was working as a health data scientist for Armus, a Silicon Valley software company, according to his father, Brad Bole.

“It’s a shock and it’s a devastation and it’s difficult for us,” Brad Bole said. “It’s something you never expect to have happened.”

The victim’s mother and sister had spoken with him for an hour on the phone Saturday evening. In addition to his Florida family, Bole is survived by his wife.

“He was really excited about his life and the work he was doing,” his mother, Patricia Tezzas, recalled of their phone conversation. “He was going to go camping next weekend.”

Bole got his Ph.D. in electrical engineering from Georgia Tech before moving to California in 2011 for an internship with NASA, his family said. He was eventually hired as a contractor for NASA’s Ames Research Center on the Peninsula, and within the last year started working at the Armus job.

His family remembered him as an avid traveler, science fiction reader and biker.

Bole was one of three people killed within a 24-hour period in Oakland shootings over the weekend. One of the victims, Oakland resident Lakeya Venson, was reportedly cleaning up after a birthday party when she was shot. Hayward resident Robert Hernandez, 34, was the third victim.

No suspect has been arrested in any of the cases. The killings brought the city’s homicide count up to 16, according to Marquez. And the violence left its mark on grieving family members near and far.

“We didn’t see each other a lot,” said Bole’s grandmother, Anna Bole, a Florida resident. “I guess the only thing I can say is we were really proud of him.”

Kimberly Veklerov is a San Francisco Chronicle staff writer. Email: kveklerov@sfchronicle.com Twitter: @kveklerov