After Bahler, aka King Romeo, posted the photo on his Facebook page, authorities saw the photo and recognized the weapon as one described from a bank robbery in Bay City, Michigan the previous day. The police then contacted the FBI and directed them towards the page.
Bahler also made the unwise decision to mention that he had purchased the gun recently in the photo caption. The first two robberies took place in Pontiac, Michigan and the third in Bay City was the only one in which a weapon was used.
Once detained, Bahler reportedly confessed to all three robberies.