SHIAWASSEE COUNTY, MI -- A meeting set up on Craigslist led to the Jan. 27 shooting deaths of two Flint men in the parking lot outside a Caledonia Township Walmart store.

The investigation by Michigan State Police has revealed a transaction to sell marijuana was set up through the website, sending Flint residents Joseph Michael Carson, 31, and Anthony Lee Hammond, 39, to meet up with a pair of brothers from Grand Rapids outside the business.

Once the Grand Rapids men arrived in the parking lot to purchase an undisclosed amount of marijuana, they robbed Carson and Hammond and fatally shot them inside a white Dodge Nitro.

Police were able to apprehend one of the suspects -- a 31-year-old man -- Saturday night in Grand Rapids.

A 23-year-old man was arrested around 9:30 a.m. Sunday morning after a search warrant was executed at a Stewart Street home in Grand Rapids in partnership between state police and the department's Special Response Team.

A vehicle has also been impounded in connection with the police investigation. The suspects are currently lodged in Shiawassee County Jail and are expected to be formally charged later this week.

The last double homicide to occur in Shiawassee County was in 2009 when gravel pit owner Michael Fuoss and anti-abortion activist James Pouillon were fatally shot by Harlan Drake.