Kansas City Chiefs kicker Cairo Santos hit a 34-yard field goal that bounced off the left upright but still managed to go through the goal post to knock off the Broncos in overtime at Sports Authority Field at Mile High Stadium in Denver.
It was the eighth-straight AFC West win for the Chiefs, who improved to 8-3 on the season.
Santos connected on two overtime field goals, the first to tie the game at 27. The Chiefs forced the game in overtime with a Tyreek Hill touchdown with 12 seconds remaining and a two-point conversion by Demetrius Harris.
The game began with eight scoreless possessions before it changed on back-to-back plays in the matter of 12 seconds in the second quarter.
First, linebacker Justin Houston sacked quarterback Trevor Siemian in the end zone, and Siemian fumbled the football. Broncos offensive tackle Russell Okung jumped on the ball, and he was touched in the end zone for the safety and 2-0 Kansas City lead.
Houston had another two sacks in the half.
On the ensuing kickoff, Hill returned the ball 86 yards for the first return touchdown of his career, and the Chiefs went up 9-0. It was his first of three touchdowns on the night.
The Broncos got on the board thanks to a Brandon McManus 33-yard field goal before the second quarter came to an end.
It was 9-3 Kansas City at the half.
Runs by rookie Devontae Booker got the Broncos into Kansas City territory, and Siemian hit WR Demaryius Thomas deep down the field to get the offense to the Kansas City 18-yard line. After a fourth-and-1 conversion at the Kansas City 9, the Broncos would face third-and-6.
Houston chased Siemian out of the pocket to his left on the third-down play, but Siemian managed to escape the pressure by rolling out all the way to the other side of the field. There, he found tight end Jordan Taylor for the 6-yard touchdown and 10-9 lead.
The Chiefs started at their own 25-yard line on the next drive, and Smith, TE Travis Kelce and RB Spencer Ware worked their way into Denver territory. The Broncos stopped the Chiefs on a third-down play at the Denver 21-yard line, but after an illegal formation penalty on a Santos field goal try, the Chiefs got a new set of downs.
Three plays later, the Chiefs ran a direct snap to Ware, which turned into a 3-yard jet sweep for a touchdown by Hill, and the Chiefs retook the lead at 16-10.
In the fourth quarter, Denver returner Jordan Norwood muffed a punt, and Chiefs long snapper James Winchester recovered the ball, but the Chiefs could not take advantage.
On the Broncos' next drive, Siemian found WR Emmanuel Sanders on two of the biggest plays of the game. First, Siemian hit Sanders down the left sideline for a gain of 64 yards. An unsportsmanlike conduct penalty moved the Broncos 15 yards back, but two plays later, Siemien connected with Sanders again, this time for a 35-yard touchdown.
The Broncos went back on top, 17-16, and then the Chiefs' next drive stalled.
On the ensuing possession, the Broncos were backed up to their 3-yard line for third-and-11, but Siemian found TE A.J. Derby for a 13-yard first down. Just four plays later, Siemian threw down the left sideline to WR Bennie Fowler, who took the ball 76 yards for the touchdown and 24-16 lead.
The Chiefs got the ball back with three minutes to go and no timeouts needing to score eight points.
Starting at their own 25-yard line, Smith and the Chiefs converted three first downs before facing a crucial fourth-and-10 at the Denver 14-yard line. Smith hit Hill on the left sideline for an 11-yard gain, and on the next play, Smith found Hill again for a 3-yard touchdown.
Smith then hit Harris on the two-point conversion to tie the game at 24 and send it into overtime.
The Broncos received the ball first in overtime, converting for three first downs before stalling at the Kansas City 26-yard line. McManus came on for the 44-yard field goal, which put Denver up 27-24 in overtime.
The Chiefs began their first overtime drive at the Denver 35 after WR De'Anthony Thomas returned the kickoff 41 yards. Smith faced second-and-8 at the Kansas City 48, and he hit Kelce to his right for a 21-yard gain. The Chiefs' drive eventually stalled at the 19-yard line, and Santos hit a 37-yard field goal to tie game.
The Broncos came back on, but their drive stalled at the Kansas City 44-yard line. The Broncos opted for a 62-yard field goal, but McManus missed.
That set up the Chiefs with great field position at the Denver 48 and eventually Santos' 34-yard game-winning kick.
Houston led the team with 10 tackles, all solo. Broncos LB Von Miller had 10 tackles (nine solo) and three sacks. Kelce finished with eight catches for 101 yards.
According to ESPN, Hill became the first player with a touchdown rushing, touchdown receiving and kick return touchdown in a single game since Gale Sayers in 1965.
The Chiefs travel to Atlanta next Sunday to play the Falcons. Kickoff is at 12:00 p.m. CT.
Photos from the Chiefs Week 12 matchup against the Denver Broncos