Aspen Victoria Geurts, 15

Aspen Geurts, a 15-year-old white teenager, was fatally stabbed Wednesday, Nov. 4 in the 300 block of Andover Drive in Claremont, according to Los Angeles County coroner’s records.

Claremont Police officers responded to a home about 5 p.m. after they received a call about the attack. Paramedics arrived and found Geurts bleeding from a stomach wound. They attempted life-saving measures, but she was pronounced dead at the scene at 5:30 p.m., according to coroner’s records.

Claremont Lt. Mike Cizek said the teenager was stabbed with a kitchen knife. Officers tracked down a 14-year-old boy walking from the residence and determined he was Geurts' brother. He was questioned then arrested on suspicion of murder.

Police said it’s unclear why the brother allegedly stabbed his sister.

“The story is kind of shaky,” Cizek said. “We only have his side of the story.”There is a third sibling who was not a home at the time, Cizek said.

The children’s parents were also not home; one was at work and the other was running errands.

“By all accounts it seems like they were pretty tight-knit family,” Cizek said. “It’s just kind of a shock.”

The 15-year-old was the first homicide of 2015 in Claremont, according to the Homicide Report.

"The bottom line: There’s no way to put any logic to an illogical occurrence," Ciszek said of the community's efforts to cope with the slaying.

But he called on residents to be mindful that a suspect has been detained.

"We don’t have some vagabond that’s going to kill someone else. The community should be at ease. We don’t have an outstanding whodunit."

Contact the Homicide Report. Follow @latimeshomicide on Twitter.