He established career-highs in several categories in 2018-19, including games played, assists, points, and average ice time (19:20). DeAngelo ranked 12th among NHL defensemen 23 years old or younger in points last season. He led the Rangers in plus/minus rating and tied for third on the team in assists in 2018-19. In addition, he led Rangers defensemen in points and was tied for first among team defensemen in assists last season. DeAngelo also ranked fifth among NHL defensemen in penalty minutes in 2018-19, and he was one of seven NHL defensemen who recorded at least 30 points and 60 penalty minutes during the season (along with Dustin Byfuglien, Mark Giordano, Duncan Keith, Tyler Myers, Darnell Nurse, and P.K. Subban). Among NHL defensemen who skated in at least 50 games in 2018-19, he ranked 16th in assists per 60 minutes of ice time (1.32) and ranked 17th in points per 60 minutes of ice time (1.53).

The 5-11, 180-pounder is one of six Rangers defensemen since the 1988-89 season who have registered at least 30 points in a season when 23 years old or younger (along with Brian Leetch, Sergei Zubov, Michael Del Zotto, Ryan McDonagh, and Brady Skjei). DeAngelo recorded an assist/point in 17 of his final 29 games of the 2018-19 season (dating back to Feb. 4, 2019 vs. Los Angeles), and he registered 18 assists over the span. His 18 assists from Feb. 4 until the end of the season were tied for the fourth-most among NHL defensemen over the span, as he was tied with Jacob Trouba and trailed only Keith Yandle (21), Brent Burns (20), and Erik Gustafsson (20) in assists during the stretch. DeAngelo posted a career-high eight-game assist/point streak from Feb. 12, 2019 at Winnipeg to Feb. 27, 2019 vs. Tampa Bay (nine assists over the span). DeAngelo's eight-game assist streak is tied for the eighth-longest in Rangers history, and it is tied for the longest assist streak by a Rangers defenseman other than Brian Leetch in franchise history. His eight-game assist streak was tied for the fourth-longest assist streak in the NHL in 2018-19, and it was also tied for the longest assist streak by an NHL defenseman during the season.

DeAngelo has skated in 132 career NHL games over parts of three seasons (2016-17 - 2018-19) with Arizona and the Rangers, registering nine goals and 43 assists for 52 points, along with 125 penalty minutes. He tallied his first career NHL goal/point while making his NHL debut with the Coyotes on Nov. 8, 2016 at Colorado, and he recorded a point in six of his first eight career NHL games. In two seasons with the Rangers (2017-18 and 2018-19), DeAngelo has recorded 38 points (four goals, 34 assists) in 93 games.

The Sewell, New Jersey native was acquired by the Rangers in a trade with Arizona on June 23, 2017. DeAngelo was originally selected by Tampa Bay in the first round, 19th overall, of the 2014 NHL Entry Draft.