The deadliest mass shooting in U.S. history: On June 12, 2016, 49 people are killed in Orlando's Pulse nightclub. Maria Elena Salinas explores how survivors made it through the ordeal while uncovering groundbreaking information about the shooter.

Mexican immigrant Felipe Ulloa never returns after going to a local bar to collect a $75 debt, then his charred remains are found in a burnt-out vehicle; even though homicide cases are difficult to close in immigrant communities, detectives prevail.