He is portrayed by Clayne Crawford.
Riggs is a Navy SEAL veteran, and can shoot from a long distance, especially with a sniper rifle. The Navy SEALs is also where he received specialized training in weaponry, tactics, and hand-to-hand combat skills. These skills would later serve him well when he became a police officer. He joined the El Paso County Sheriff's Office in El Paso, Texas, and was eventually partnered up with Jenkins in the Narcotics Division. Around the time he became a cop, he met a beautiful woman named Miranda Delgado, and eventually married her. According to Riggs, Miranda was really good to him and "gave him something to live for," which implies that she was one of the very many things in his life, other than his occupation as a police officer, that kept his life going well together. However, after some years of their marriage, when they were close to having their first baby, she was killed in a car crash, which sent him into a deep depression.
Having recently suffered the tragedy of the recent death of Miranda, and their unborn baby, he transfers to the LAPD in Los Angeles and starts life over again moving from El Paso, Texas. There, six months later, he is partnered up with 22-year veteran LAPD Detective Roger Murtaugh in the Robbery/Homicide Division, after foiling a attempted bank robbery. He thinks they'd make a great team, but Murtaugh thinks otherwise for now, due to his suicidal thoughts. But along the way, he seems to be turning his suicidal thoughts around as he's found something to live for: having Murtaugh as his partner, and for Miranda's family, who live in L.A., especially his father-in-law Ronnie Delgado, and even for Miranda.
As of recently, Riggs has found out that the Flores drug cartel, he and Murtaugh and Palmer have been investigating, was in connection with Miranda's death. Once he had learned this and that she was killed, by Flores' henchman Gideon Lyon, for revenge on his father-in-law, Ronnie, because he refused to cut a deal with Flores, Riggs had traveled to Mexico to avenge her death. With the one on one dual between Riggs and Lyon, and Riggs killing Lyon, Riggs had avenged Miranda and was able to put his demons to rest and get on with life once again.
Riggs may seem like just any typical police officer, but he is really devoted to his work as a police officer, and is very adamant about getting the job done as much as possible. Having been a Navy SEAL, before his career as a cop, he can shoot from a long distance with his sniper rifle, a Barrett M82A1M, and he has no problem using his it when ever necessary, as it was shown in the first episode.
After the loss of his wife, Miranda, he feels as though his life was and is tearing apart, and often feels suicidal. But everyday, when he wakes up, he thinks of a reason not to commit suicide, such as continuing to do the job as a cop. However, also, as he's partnered up with Murtaugh, he finds himself turning away from his suicidal thoughts as having him as a partner keeping his life going, and continuing to live on for Miranda kept his life going on for him, and for Miranda's family, too, including Ronnie.
As much as he is proud to have Murtaugh as a partner, he deeply appreciates him and Trish accepting him as part of their family, and he accepts proudly them as family. He also seems to have a thing for Karen Palmer from the day they met, as they seem to be spending time together.
Riggs has brown hair, a mustache, and stubble facial hair. He often wears collared long-sleeved shirts with jackets, and even short-sleeved shirts at times. Riggs drives a 1977 Ford F-350, and his weapon of choice he carries is usually a Beretta 92FS.
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