India, May 26 -- Nearly four months have passed since Nancy Guthrie went missing, but investigators have barely made any progress in solving the case. The only major public clue remains the suspect's video caught on Nancy Guthrie's door camera. Now, former FBI agent Jennifer Coffindaffer has put forth a new hypothesis on the suspect known as "porch guy."

Speaking about the case in a social media post, Coffindaffer explored three possible motives behind the mysterious disappearance and questioned whether the suspect could have been involved in a larger criminal operation.

One theory she discussed was the possibility of a so-called "wrench attack," a term often used to describe violent crimes where victims are physically threatened or ass...