Tim Samaras and Carl Young, stars of Discovery Channel’s Storm Chasers, along with Samaras’s son Paul, were killed during Friday’s horrific tornado in El Reno, Oklahoma, just hours after appearing on MSNBC’s the Cycle. Tim was 55, his son 24.

Samaras had been involved in severe weather research for three decades, having founded TWISTEX (Tactical Weather Instrumented Sampling in Tornadoes EXperiment), a system for predicting and tracking storms. Since ending Storm Chasers, he was a frequent go-to expert for reporting and commenting on extreme weather events.

Just hours before the tornado, Samaras had been a guest on MSNBC’s The Cycle, now his last recorded cable news appearance, to discuss the coming storm.

Watch Samaras’s last segment below:

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