While following a tornado in El Reno, Okla. on Friday, Storm Chasers' star Tim Samaras, his son Paul and colleague Carl Young lost their lives.
CNN reports they were among the nine people killed by storms that night.
"We are deeply saddened by the loss of Tim Samaras, his son Paul and their colleague Carl Young. Our thoughts and prayers go out to their families," Discovery Channel said in a statement.
According to their website, Samaras founded TWISTEX, the Tactical Weather Instrumented Sampling in Tornadoes Experiment, to learn more about tornadoes and increase time for warnings.
This is a devastating loss to the meteorological, research, and storm chasing communities. I ask that you keep the families in your thoughts and prayers during this very difficult time. There is some comfort in knowing these men passed on doing what they loved..."