Mrs. Alvarez is the widow of Ramon Alvarez, a 5-year Navy SEAL veteran, and the murder victim that Riggs and Murtaugh were investigating the death of.
Being a family woman, Mrs. Alvarez takes her relationship with her family very serious. She takes her son Oscar very serious, too.
After Mrs. Alvarez and Oscar were informed that Ramon was dead, she rather disturbed. She mentioned to Riggs and Murtaugh how they were going to start things over when they'd be planning to move to Arizona. Then they went back to investigating Ramon's death.
As Murtaugh and Riggs were investigating the death of Navy SEAL veteran, Ramon Alvarez, they found out that he was involved in something he never wanted to get mixed up in. Mrs. Alvarez kept a lid on something going on for a while. Riggs finds out she is being watched, and questions her further on what all was going on. She explained that her son Oscar didn't come home after school, and was kidnapped by Levon Tibibian, Daryl Hennicky, and the rest of their men, and remains to be held hostage until she can give Tibibian and his men the heroin Ramon stole from, which she knew nothing about at first. Riggs goes after them and gives them their heroin and gets Oscar. Just when it's about to go South, a shootout occurs, Riggs gets Oscar out of the way, and Murtaugh joins in and they shoot them all down, including Tibibian. Mrs. Alvarez and Oscar are reunited soon after.