Question

insert dashes where needed. tim samaras the legendary storm chaser killed by a deadly tornado in 2013 was known for his daring missions to collect data from passing storms.

Explanation:

The appositive "the legendary storm - chaser killed by a deadly tornado in 2013" needs to be set off with dashes. It provides additional information about Tim Samaras.

Answer:

Tim Samaras - the legendary storm - chaser killed by a deadly tornado in 2013 - was known for his daring missions to collect data from passing storms.