Alan Campbell's Coerced Complicity
The Picture of Dorian GrayDorian Gray blackmails his former friend Alan Campbell into disposing of Basil Hallward's body, leading to Campbell's own suicide.
increasing
Bearing strength in each event
decreasing
Former Friendship

Former Friendship
The Intimate Bond
Alan Campbell and Dorian Gray were once inseparable friends, united by a love of music. Campbell is a brilliant chemist. Their friendship ended abruptly, for reasons not disclosed, but Campbell still harbors resentment.
The Broken Connection
When they meet in society, Dorian smiles but Campbell is cold. Their past intimacy makes the blackmail even more painful.
The Summons

The Summons
The Urgent Request
Dorian sends a note to Alan Campbell, asking him to come on a matter of life and death. Campbell reluctantly agrees. He arrives at Dorian's house, stern and pale.
The Confession
Dorian tells Campbell that a dead man is in the locked room and that he needs Campbell's scientific expertise to destroy the body. Campbell refuses, horrified. But Dorian has a letter that can ruin Campbell.
The Blackmail

The Blackmail
The Letter's Power
Dorian produces a letter that implicates Campbell in some unnamed crime (probably a homosexual relationship). He gives Campbell the choice: help dispose of the body or face exposure. Campbell is trapped.
The Moral Collapse
Campbell, desperate, agrees. He writes a list of chemicals for Dorian's servant to fetch. The pressure of the blackmail breaks him psychologically.
The Chemical Destruction

The Chemical Destruction
The Scientific Erasure
Campbell goes up to the locked room with his equipment. Dorian waits downstairs. Hours later, Campbell returns, pale but calm. He says he has done what was asked. The body is gone, reduced to ashes.
The Permanent Scar
Campbell tells Dorian they must never see each other again. He leaves, burdened with the secret. The experience destroys his peace of mind.
Campbell's Suicide

Campbell's Suicide
The Inevitable End
Unable to live with the guilt and the memory of his complicity, Alan Campbell shoots himself in his laboratory. He does not reveal Dorian's secret, but his death adds another weight to Dorian's conscience.
The Ripple Effect
Dorian learns of the suicide from Lord Henry, who remarks on it as another scandal. Dorian feels a pang but quickly rationalizes it. Campbell's death is another link in the chain of destruction that Dorian leaves behind.
Five years before the murder
Morning after the murder, Chapter XII
Later that morning, Chapter XII
During the afternoon, Chapter XII
Some time after the murder, mentioned in Chapter XIII