"I Do n't Wanna Live Without Your Love" is a hit song written by Diane Warren and Albert Hammond for the group Chicago and recorded for their album Chicago 19 (1988), with Bill Champlin singing lead vocals. The first single released from that album, it reached number three on the U.S. Billboard Hot 100 chart. The B-side of the single was "I Stand Up" written by Robert Lamm and Gerard McMahon. The song was featured in the Netflix original movie Death Note, which is based on the anime of the same name.

Who sang i don't want to live without your love? Okie... think carefully first, then make a decision:
The relevant sentence in the passage is: "I Do n't Wanna Live Without Your Love" is a hit song written by Diane Warren and Albert Hammond for the group Chicago and recorded for their album Chicago 19 (1988), with Bill Champlin singing lead vocals. So, the answer is Bill Champlin.