Time and environmental factors are complicating the search for Brian Laundrie, experts say

The search for Brian Laundrie, the fiance of Gabby Petito, is heading into another week and authorities seem no closer to finding him.

Laundrie has been charged with using two financial accounts that did not belong to him between Aug. 30 and Sept. 1. No charges have been brought against him in the death of Petito, whose body was found in Wyoming's Bridger-Teton National Forest.

Petito's manner death was ruled a homicide.

The search is continuing as investigators try to piece together what happened to Petito, 22, and Laundrie, 23, on their road trip through the West this summer. The couple had posted online regularly about their travels with the hashtag #VanLife, but those posts abruptly stopped in late August.

Laundrie returned to his parents' home in North Port, Florida, on Sept. 1 without Petito, police said, and was home for about two weeks. His parents told authorities Sept. 17 that they last saw him three days earlier.