Craig Melvin lost his beloved brother, Lawrence, to colorectal cancer and his efforts to raise awareness of the disease are as strong as ever. The Today show host and his wife, Lindsay, hosted The Bottoms Up Invitational golf tournament over the weekend and he spoke to HELLO! in an exclusive chat ahead of the event. MORE: Craig Melvin details heartbreaking details of father's battle with addiction Craig's sibling was only 39 years old when he was tragically diagnosed with stage 4 cancer after suffering with abdominal pain and weight loss.WATCH: Craig Melvin opens up about his family and his father overcoming addiction It was a shock to him and his loved ones who were unaware that there was a history of the disease in Craig's family. Now the TV star is working tirelessly with the Colorectal Cancer Alliance in a bid to boost screenings, raise money for research and to destigmatize this type of cancer which is 100% preventable.MORE: Craig Melvin takes on exciting project away from Today GALLERY: The Today show hosts' epic homes: Al Roker, Hoda Kotb, Jenna Bush Hager, more"Before my brother died I became very involved in the Colorectal Cancer Alliance," Craig told HELLO!.