The memorial from above
Mac and Charlie watch their own service from the vents. Dennis refuses the request to burn Mac’s duster.
Supporting source ↗CASE FILE · S04 E06

Frank, Dee and Dennis find unique ways of dealing with the loss of Mac and Charlie. The guys faked their deaths to avoid Mac's vengeance-obsessed father, who was released from prison.
THE SHORT VERSION · SPOILERS AHEAD
Mac and Charlie watch their own service from the vents. Dennis refuses the request to burn Mac’s duster.
Supporting source ↗Dennis welcomes Jan, while Frank gives a mannequin Charlie’s clothes and a voice of its own.
Supporting source ↗Dee takes the bus, finds the fugitives and demands a replacement for the car they destroyed.
Supporting source ↗Their return surprises nobody. Luther’s letter says he is leaving for Tijuana and wants distance, making the elaborate escape unnecessary.
Supporting source ↗THE EVIDENCE
Bonnie cries while seated at the memorial.Source ↗
Charlie and Mac are confronted on the rooftop by Dee.Source ↗
Dee argues beside the driver at the front of a crowded bus.Source ↗
Dennis conducts the memorial in Mac’s duster.Source ↗
Frank brings a Charlie-like mannequin into the bar.Source ↗
Luther appears in a brief mirror scene.Source ↗
The driver confronts Dee at the front of the bus.Source ↗
Frank tends to his substitute roommate beside the bed.Source ↗
Dennis interviews a replacement roommate at his front door.Source ↗
Folding chairs and a projection screen fill the memorial space.Source ↗
Frank holds a bearded mannequin dressed like Charlie.Source ↗
Dennis clears Mac’s nunchucks with the rest of his belongings.Source ↗
Frank waits beside the bathroom partition with the mannequin.Source ↗
Mac and Dee burst into the bar for the big reveal.Source ↗
Dennis wears the long black coat during his tribute.Source ↗
A sparse audience attends Mac and Charlie’s memorial.Source ↗
Tags document researched occurrences, not every appearance. Read the research notes and attribution.