Killian Deron Antron Hayes (/ˈkɪliən/ KIL-ee-ən;[1] born July 27, 2001) is a French-American professional basketball player for the Long Island Nets of the NBA G League.

The son of basketball player DeRon Hayes, he was born in Lakeland, Florida but grew up in France due to his father's professional career.

Hayes won the gold medal and earned most valuable player (MVP) honors with France at the 2017 FIBA U16 European Championship.

[2] One year later, Hayes began living in Cholet, France after his father continued his career in the LNB Pro A, the country's top league.

[6] In April 2017, he recorded 13 points, seven assists and five steals, sharing most valuable player (MVP) honors with Addison Patterson, at the Jordan Brand Classic International Game.

[8][9] Hayes made his debut with the Cholet senior team on October 21, 2017, at 16 years, two months and 24 days of age, playing two minutes in a loss to Nanterre 92 in the LNB Pro A.

[10] In February 2018, he played in the Basketball Without Borders camp during NBA All-Star Weekend in Los Angeles, where he was the second-youngest participant.

[14] On September 22, 2018, after missing three weeks with back and toe injuries, Hayes scored 12 points in a loss to Strasbourg in his first appearance of the season.

[15] After his team was last place in its league early in the season, it parted ways with head coach Régis Boissié, who was replaced by Erman Kunter.

"[3] At 2019 NBA All-Star Weekend in Charlotte, North Carolina in February, he competed at the Basketball Without Borders camp for the second time.

[3] On August 2, 2019, Hayes signed a three-year contract with ratiopharm Ulm of the Basketball Bundesliga (BBL), the top league in Germany, and the EuroCup.

[22] On November 20, he tallied 12 points and 11 assists in a loss to Promitheas Patras, becoming the second-youngest player to ever register a double-double in the EuroCup, the youngest being Ricky Rubio.

[29] On January 4, 2021, in a 115–125 loss to the Milwaukee Bucks, he suffered a hip injury, which was diagnosed as a labral tear two days later.

[43][44] At the 2018 FIBA Under-17 Basketball World Cup in Argentina, Hayes won a silver medal and was named to the All-Star Five after averaging 16.1 points, 3.6 rebounds, 3.3 assists and 2.7 steals per game.

[13] In July 2019, the French Federation of Basketball imposed a six-game suspension on Hayes for not playing in the 2019 FIBA U20 European Championship in Tel Aviv, Israel.

In February 2020, The Athletic writer Sam Vecenie said that "his vision is absolutely off the charts, and his ability to complete passes off of a live dribble with his left hand is unbelievable out of ball screens.