The initial attic search was negative, but the K-9 officer went further into the attic. There he discovered, covered and challenged the prone suspect, who was facing away from officers and wearing only boxer shorts.
The K-9 officer commanded the suspect (who appeared to be complying with commands) to crawl back to the officers. As he did so, the deputy U.S. Marshal transitioned from his firearm to his TASER.
It appears the K-9 officer was about to handcuff the suspect (who continued to appear compliant, including verbally). The marshal perceived a threat and fired his TASER, striking the suspect. Almost simultaneously, the 6-foot, 4-inch 284-pond suspect suddenly lunged at the 5-foot, 6-inch 165-pound K-9 officer, and the deputy heard them "tussling." While being TASERed, the suspect acted verbally compliant.
Then the Marshal heard a gunshot, and fired his TASER again. There were three rapid gun shots, and the Marshal saw the K-9 officer roll off the suspect. The Marshal transitioned to his firearm and was shot twice (lower front vest and groin) and fell back through the attic opening onto the detective and onto the floor. The suspect began to fire rounds from the attic through the ceiling at officers.
An SPPD officer pulled the wounded Marshal into a bathroom. Other officers called to the downed K-9 officer (no response) and issued commands to the suspect, who responded by firing random gunshots in the direction of the officers' voices.