A CHEF LITERALLY BEARING THE WEIGHT OF THE GUILT HE FEELS OVER THE ACCIDENTAL DEATHS OF HIS YOUNGER BROTHER AND SISTER SEEKS HELP FOR HIS BODY AND SOUL, ON ABC'S "EXTREME WEIGHT LOSS"

UFC Founder Dana White + MMA Stars Vitor Belfourt, Ronda Rousey, Urijah Fabar and Michael Bisping Guest Star

"David" (St. Louis, MO) - As a child, David often served as caretaker of his younger brothers and sister while his parents were at work. When he was 17, David eschewed his responsibilities for one night and went to a party with his friends. While he was gone, one of his two younger brothers broke into their father's gun cabinet and accidentally killed David's other brother. Mere weeks later, David fell asleep before giving his epileptic sister her medication and she died of a seizure in her sleep. Unable to deal with the guilt from their deaths, David became an excessive eater, eventually reaching 413 pounds. David's yearlong physical and emotional transformation will be documented on the hit series "Extreme Weight Loss," airing TUESDAY, JULY 8 (8:00-10:00 p.m., ET/PT) on the ABC Television Network.

At 30 years old, David's life seems great: he's a successful chef for a university in St. Louis with a beautiful long-term girlfriend eager to take the next step in their relationship. Unfortunately, unable to forgive himself for the deaths of his siblings 12 years ago, David constantly sabotages his own chances at happiness. Wanting to end his self-imposed cycle of guilt and punishment, David wrote a letter to trainer and transformation specialist Chris Powell asking for help. Chris will not only guide David on his 365-day journey to lose half his body weight, he'll also help David gather the courage to sit down with his parents to try to come to terms with the loss of his brother and sister.

Also in the episode, David will get a chance to live his lifelong dream of being an MMA fighter. With an assist from Chris, David will get VIP treatment from the UFC during one of the biggest fights of the year in Las Vegas. He'll also get to meet UFC Founder Dana White, along with champion fighters Vitor Belfourt, Ronda Rousey and Urijah Faber as he prepares to compete in an MMA challenge with UFC veteran Michael Bisping.

New in Season 4 for "EWL," in addition to working with Chris and Heidi Powell, each participant spends the first 90 days of his or her weight loss journey at the renowned University of Colorado's Anschutz Health and Wellness Center (AHWC) in Aurora, CO.

Chris and Heidi, along with AHWC's medical director Holly Wyatt, MD, associate professor of medicine at the University of Colorado, guide participants on their journeys to safely lose up to half their body weight, ultimately revealing an amazing metamorphosis. The Anschutz Health and Wellness Center offers some of the country's most advanced research and science-based expertise, focusing on a comprehensive weight loss and weight loss management approach, including fitness, nutrition and wellness services.

"Extreme Weight Loss" is produced by Eyeworks USA. JD Roth, Todd A. Nelson, Matt Assmus and Brant Pinvidic are the executive producers.

For more information on "Extreme Weight Loss," visit ABC.com