( KTRS ) The search for a missing 13 yr old and her new born son continues.

Last week 39 yr old Christopher Derleth, reportedly kidnapped his step-daughter, 13 yr old Katherine Elizabeth and her new born son.

The three are believed to be in West Virginia. Authorities now say that Katherine has a pacemaker, due to a heart condition, but doesn’t have the equipment needed to monitor it. She is also recovering from C-section delivery.

Derleth was last seen south of Charleston, West Virginia, collecting supplies for camping, and could staying at a free campsite anywhere in the country.

Authorities have now issued a nationwide arrest warrant.