Have him run over by 1,000,000 trucks

Putting him in a and I must scream fate.

Hired doom slayer to kill him

Blow his head off with shotgun.

Chop all his limbs off, cut off his genitals and bury him alive.

Diavolos death loop style

Send him to the dark web people and tell them to give him as much pain as possible

Get the dragon balls to tell Shenron for Ligma to be a real disease (as well as being a horribly painful one) and then wish for Ligma to be exclusively inflicted on Judge Holden, the last wish is for him to stub a rusty molten hammer nail (or a Asian Giant Hornet stinger) in between his toenail and if not I will use it for him to give me $1000 dollars

Burn him

Put him through the same torture AM gave the last 5 humans for 109 years.