A 17-year-old Utah boy is accused of killing his mother and 8-year-old half-brother after prosecutors say a masked figure matching his build was caught on camera roaming the neighborhood in the hours after a late-night shooting.

Saratoga Springs police arrested the teen on Aug. 14 after a 17-month investigation involving dozens of search warrants, hundreds of pieces of evidence and extensive forensic testing, the department said.

The teen was booked into juvenile detention after detectives screened two counts of first-degree murder with the Utah County Attorney’s Office, police said.

Prosecutors later charged him in juvenile court with two…

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