Wintergreen

William Randolph Wintergreen grew up in Oxford, England.

He worked with MI-5 and the British Army. When he was working in the British Army he met Slade Wilson. The two became close friends.

When General Sampson sent Slade Wilson on a suicide mission, Wintergreen charged in to rescue Slade disobeying Sampson’s orders.

Wintergreen was transferred closer to Slade after he met Adeline; Wintergreen later became the best man of Slade in his wedding.

In revenge of what Wintergreen did years ago, General Sampson sent Wintergreen on a suicide mission. When Slade received word that Wintergreen was being a prisoner of war; He went to Hanoi to rescue Wintergreen.

Because of the rescue, Wintergreen felt he owed Slade his life

Part of the family

After the divorce between Slade and Adeline, Wintergreen became Slade’s right hand man, acting alternately as moral conscience, comrade in arms and nursemaid (Similar to the relationship between Alfred and Batman).

Deathstroke

Wintergreen helped Slade to fulfill an H.I.V.E contract to capture all members of the new teen titans, however Wintergreen felt that it was a wrong decision to take that contract and ally himself with Terra.

When Slade started hunting in Africa, Wintergreen went with him and stayed at his side. After some time Slade returned to be a mercenary, only that this time with a code of ethics. Wintergreen continued as the right hand of Slade.

Rose

When Rose's mother died, Slade fearing that he would not be a good father; left Rose in the care of Wintergreen.

Wintergreen a lot for Rose and even to the level to wanting to adopt her.

Goodbye Deathstroke

When Deathstroke suffered a explosion that killed him (returned thanks to his immortality) he lost all memories and broke all relationships with Wintergreen.

Death

When Deathstroke discovered that the spirit of his son Joseph ( Jericho), was taking refuge inside his body he asked Wintergreen’s help to have an exorcise and get rid of the spirit . Jericho (in control of Deathstroke’s body) killed Wintergreen.

Wintergreen’s dying words to Deathstroke were: "I suppose it was only a matter of time."