In the pilot of The Unicorn, Wade and his two daughters, Grace (Ruby Jay) and Natalie (Makenzie Moss) are still subsisting off the food people made for them right after Jill’s death. Their home is in disarray, and it’s evident that the family has let a lot of things go by the wayside since Jill’s passing.

Wade’s friends, including Delia (Michaela Watkins), try to encourage him to move forward and to remember the things that used to interest him.

“You know, when Jill got sick, you took care of her and the girls,” Delia tells him. “And you were such a rock star.”

Viewers later learn that Wade’s late wife passed away after a battle with terminal cancer. She had been with Wade for more than 20 years at the time of her death, leading him to flounder when it came to life without her. As the first season progresses, Wade becomes more comfortable with dating, and with sharing stories about his wife to potential love interests.

Source : https://www.distractify.com/p/how-did-the-mom-die-in-the-unicorn