1. Chiefs can't sustain first-half success, drop fourth straight on Sunday to Bears

For the most part, things were going fairly well for the Kansas City Chiefs in the first half of Sunday's game against the Chicago Bears.

They held a 17-3 lead going into halftime, committed just one penalty for 10 yards and hadn't turned the ball over.

But the second half was a different story.

The Chiefs managed just 123 yards of total offense in the second half, largely due to the absence of their best player, running back Jamaal Charles.

Despite that, they had multiple chances to finish the Bears and put the game out of reach, but they weren't able to do it.

It ultimately gave the Bears a chance to respond—which they did.

2. Jamaal Charles leaves game with non-contact knee injury

Midway through the third quarter, Jamaal Charles went down with a knee injury and did not return.

He was quickly ruled out for the game.

In his postgame presser, Chiefs coach Andy Reid confirmed that the preliminary reports on Charles' right knee are a torn ACL, although they were still awaiting confirmation from an MRI.

It was a devastating blow that after the game Reid said his team never really got over.

Before the injury, Charles had 12 carries for 58 yards.

3. Chiefs defense gets them on the board early

All season, Jaye Howard has been a nightmare for opposing teams to try and block, and he welcomed Bears rookie center Hroniss Grasu, who was making his first start and was active for the first time this season, to the NFL on Sunday.

With the Bears facing a second-and-11 from the 8-yard line, Howard broke through to sack quarterback Jay Cutler in the end zone and force the fumble, which was recovered by rookie linebacker Ramik Wilson.

It was the second defensive touchdown for the Chiefs this season. The other was Marcus Peters' pick-six off Peyton Manning a few weeks ago.

Wilson made the most of his opportunity in his first NFL start to fill in for the injured Josh Mauga. He finished with 4 tackles and a fumble recovery in the end zone.

4. Marcus Peters competing

There were plays that Marcus Peters made on Sunday that displayed the kind of ability that people talk about when they say he doesn't look like a rookie cornerback.

There were also several passes completed that were thrown his direction.

It wasn't a dominant performance, but the "short memory" often talked about as paramount for the psyche of a young defensive back seems to be there for Peters.

Just seconds after being one of the guys in coverage on Wilson's impressive touchdown reception, Peters responded with a great play on the two-point conversion attempt.

He made a fantastic tackle on Bears receiver Marc Mariani less than an inch before he was able to reach the pylon on the two-point attempt.

Ultimately it didn't lead to a Chiefs win on Sunday, but it's the kind of play and ability that will in the future.

5. De'Anthony Thomas touchdown reception

He has the kind of speed that defenses always have to account for whenever he's on the field.

As soon as De'Anthony Thomas got the block from Jeremy Maclin and got around the edge—he was gone. The third-and-6 play from the 19-yard line resulted in a touchdown.

It gave the Chiefs the 14-3 lead with 9:57 remaining in the first half.

6. Jaye Howard and Allen Bailey made plays in the trenches

In addition to Howard's sack of Cutler in the end zone that helped give the Chiefs their first touchdown, there were a handful of other plays he made at or behind the line of scrimmage.

He said after the game in our interview for "Chiefs Rewind" that it's his individual goal to make the Pro Bowl this season. He finished the game with 8 tackles, including 2 for loss and the big sack that led to the early touchdown. 

Bailey finished the game with 7 tackles (5 solo), including 1 for loss, a QB pressure and the forced fumble that led to a defensive touchdown.

For Allen Bailey, he was able to bring down Cutler in a crucial time of the game with the Chiefs holding a 17-6 lead early in the fourth quarter.

Cutler tried to hurdle him as he moved around the pocket and Bailey was able to get an arm up and bring him down for the sack on third down.

7. Bears quarterback Jay Cutler made big plays in key moments

The Chiefs defensive backs were challenged throughout the game and came away with their fair share of quality plays, but Cutler made a few more.

Cutler's 22-yard touchdown pass to Marquess Wilson midway through the fourth quarter couldn't have been thrown any better, fitting it perfectly between two Chiefs defensive backs.

Finally, with his team trailing 17-12 and under a minute to play, Cutler took the snap off the top of his shoes and still managed to throw a beautiful pass to Matt Forte in the corner of the end zone for the 7-yard touchdown.

It was the game-winning touchdown and another crippling blow late in the game to the Chiefs at Arrowhead Stadium.

8. Cairo Santos has one field goal attempt blocked, other falls short from 66 yards

Just moments after Charles' injury, Cairo Santos had a 27-yard field goal blocked that would have given the Chiefs a 20-3 lead early in the second half.

Then, after 15 unanswered points from the Bears offense that gave them a 18-17 lead, Santos was given the opportunity to try and hit from 66 yards to win the game for the Chiefs with just seconds remaining.

The attempt fell short and the game was over.

Coach Reid said after the game that the odds of Santos hitting from 66 yards were better than attempting a Hail Mary, and that Santos had hit from that distance in practice before.

9. Charcandrick West sees majority of carries behind Charles

West finished the game with 7 carries for 31 yards, which are both career highs for him.

Of those 7 carries, 4 of them came after Charles' injury.

After the game, Reid said West and Knile Davis would both see action in the backfield moving forward with the injury to Charles.

10. Dustin Colquitt remains pretty good

Colquitt recorded 7 punts for 331 yards (47.3 avg., 41.6 net) with four landing inside the 20-yard line, bringing his career total to 327, which is the Chiefs all-time record. His four inside the 20-yard line tie his season high in that category, matching his mark from Week 1 at Houston (9/13/15). It didn't lead to a victory, but Colquitt didn't make it easy on the Bears, consistently flipping field position in the Chiefs favor.