Aequitas clearly silenced him and tried to pin his death on Aphotis, she only had one drink, that's all.

I heard from someone very close to the DC that Appius Wight was really the Mother... or was that SlimJim "Other Mav" Lapdance that was the Mother... you know how the rumor mill works

I heard he was out hunting dragons, but what I really think happend is he slipped on a banana during a senate meeting and was so embarassed that he disappeared off the face of the galaxy. Might have to hunt him down one of these days.

He got lost on the way to the bathroom. (It's not his fault, the halls are like a labyrinth.)

Appius owes a Hutt Crime Lord so much he has to work off his debt in a slave dancer outfit at a rate of 10 credits a month

Officially, Appius "retired." This is coded language for "vanished without a trace, leaving behind only a faint scent of burnt hair and existential dread." In an attempt to upload his consciousness into a Force program he wrote to try to achieve immortality, he ultimately became the Force's screensaver. If you meditate deeply enough, focusing on the cosmic balance and the will of the Living Force, you can sometimes catch glimpses of him. He manifests as a pixelated image of himself, floating serenely through the cosmic void, occasionally bumping into celestial bodies with a soft "boop."

He got eaten by a Sarlak, got out and is now living the high life in a comfy vacation home on an unknown planet.

I heard a rumor Appius was killed, then stuffed with hay and propped up in a moisture vaporator farm on Tattooine as a scarecrow as a repellent for Tusken Raiders.

"I heard Appius Wight took a fight to a sarlacc pit."
'...Did he win?'
"***Did he win?!*** It's a bloody Sarlacc, mate! O' course not!"