Near the end of the second period, Maroon hit Kings defender Drew Doughty, making contact with his head. Maroon was given a match penalty on the play.
Doughty went through the concussion protocol and returned to the game in the third period.
"I'm a big forward, I'm just going in to do my job on the forecheck," said Maroon post-game. "My body was inward, my elbows didn't come up - nothing came up - it's just unfortunate that my follow through hit him in the head. I'm glad he came back and finished the game."
Doughty commented on the hit following the match.
"I've known Maroon for a long time and he's just trying to finish a hit," he said. "I don't know that he meant to try to hurt me or anything like that. I forgive him."
Oilers Head Coach Todd McLellan weighed in himself.
"He made contact with Drew's head," he said. "It's obviously not a legal play and he deserved a penalty on it. Was it a match penalty, I don't know. I thought Drew was trying to swipe the puck away and lowered himself in."
Edmonton failed to capitalize on any of their three power plays and finished the night 3-for-6 shorthanded.
"It sucks the life out of us," said McLellan of the penalty kill, which sits last in the League. "We were OK for two periods, made a mistake and they scored. But the major penalty, it sucked the life out of us."
Cam Talbot made 28 saves and Leon Draisaitl had a team-high four shots on goal.
Despite 26 shots total in the first, the two clubs exited the opening 20 scoreless.
In the second frame, Jake Muzzin blocked Jujhar Khaira's shot early in the period to keep the game deadlocked. Draisaitl's shot from the right side found its way to Khaira, who had a wide-open net but Muzzin made like a wall.
It wasn't until 14:21 when the puck would cross a goal line, with the Kings being the benefactors. Torrey Mitchell dished the puck to Andreoff just within the Oilers zone, giving the winger a partial break. He ripped a shot blocker side past Talbot to go up 1-0. The goal was Andreoff's second of the season.
Edmonton got close to evening the game in the final minute of the stanza. In a shift fuelled by Connor McDavid's speed and vision, Puljujarvi caught Quick out of position. His shot rang off the crossbar and out, keeping Edmonton down by one heading into the third. McDavid has now gone three games without a point for the first time in his career.
Before the period closed, Maroon caught Doughty high, causing Derek Forbort to engage him in a fight. Forbort and Maroon each got five minutes for fighting, but Maroon received a match penalty for hitting to the head, giving Los Angeles 4:56 of power-play time to open the third.
Los Angeles scored a trio of goals with the elongated power play early in the final 20. Trevor Lewis, Dustin Brown and Adrian Kempe scored, putting the Kings up 4-0 with 15:26 still remaining in the game.
"We've pounded away on a lot of it, especially the last two weeks," said McLellan of the PK. "We'll keep pounding away."
Marian Gaborik first wristed a shot from the slot that was tipped by Lewis in front. The Kings still had 3:20 of power-play time remaining.
Brown's first marker of the night followed. Anze Kopitar fed the puck through the Oilers crease and Brown swatted at the puck just before it crossed the line.
"The penalty kill has to at least show up and instill a little bit of confidence on the team and it's not doing that," McLellan continued. "When we get on the road, we feel pretty good about it. It's what we do at home."
The Oilers own the fifth-best penalty kill on the road with an 85.1 percent clip.
On Kempe's strike, the puck hit off the glass behind Talbot and the netminder turned to the wrong side of the net as it gravitated back towards the crease. Kempe scooped up the puck on the left side of the pipe and deposited it.
Brown added his second of the game and 15th of the season late to make it 5-0.
"We have to find a way to break through offensively in the first place and find a way to stop the opposing power plays," said Nugent-Hopkins of the Oilers current slump. "It's about not getting frustrated right now, not getting down on ourselves and coming out on the other side."
Edmonton faces the Anaheim Ducks on Thursday. Puck drop is at 7:08 p.m. MST.