Life Flight is book 1 in the Extreme Measures series by Lynette Eason. So far there are only two books in the series, but hopefully, there will be more to follow.
Story of Life Flight
“EMS helicopter pilot Penny Carlton is used to high-stress situations, but being forced to land on a mountain in a raging storm with a critical patient—and a serial killer on the loose—tests her skills and her nerve to the limit. She survives with FBI Special Agent Holt Satterfield’s help. But she’s not out of the woods yet.” (Editorial review – Amazon.com)