Before he was arrested on suspicion of carrying out the assassination, 22-year-old Tyler Robinson sent friends messages showing that he was closely following news about the killing.
F.B.I. leaders touted the immense federal deployment assigned to find the assassin. But their big break came with a single tip — from the suspect’s own family.
The grainy images show a man wearing a baseball cap, dark sunglasses and a black long-sleeve shirt with an image on it that appears to include, in part, a picture of the American flag.
Kash Patel, the F.B.I. director, said that the agency’s investigation was continuing, reversing his earlier announcement that someone had been apprehended.
Tom Phillips, who vanished with his three children in 2021, was killed after he shot a police officer on Monday, the authorities said. His children were found safe and unharmed.
An image released by the New Zealand Police that the authorities say shows the fugitive Tom Phillips and one of his children on the country’s North Island last month.
The man is accused of fatally shooting four people in a bar in Anaconda, Mont. He had led the police on an eight-day manhunt that rattled the community.