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HIGHLANDS RANCH, Colo. — Douglas County Sheriff Tony Spurlock made an unannounced visit Tuesday to the apartment where one of his deputies was gunned down on New Year’s Eve morning.

Spurlock spent about 20 minutes inside Matthew Riehl’s home at the Copper Canyon Apartment Homes. He was with Aurora police chief Nick Metz and three other law enforcement officials.

“Still an ongoing investigation of what was taking place inside,” Spurlock said after going through both bedrooms and looking out the windows that are now shattered.

Spurlock said Riehl ambushed four deputies Sunday morning and killed deputy Zackari Parrish.

Riehl fired more than 100 rounds from a rifle and wounded three more deputies, a Castle Rock police officer and two neighbors.

A tactical team shot and killed Riehl about 90 minutes after the shooting started.

“Um, that’s a hard answer. That’s a hard question to answer,” Spurlock said when asked what he saw in the apartment. “I don’t want to get into any details about that at this point because we’re still investigating the suspect and particulars about him.”

The sheriff said he would release more information about what’s inside the apartment and about the investigation after the funeral for Parrish on Friday.