Mr. Bones was cursed before he
was even born. His mother was an
unknowing test subject of twisted
geneticist Dr. Benjamin Love.
Along with a handful of other
expecting mothers, she was
treated with experimental drug that
mutated their children in
unexpected ways. Bone was born
with invisible musculature and
organs - including his skin - making
him appear to be a walking
skeleton, and by adulthood had
developed superhuman strength
and a poisionous touch (his sweat
is composed of a cyanide
compound that kills normal humans
on contact.

Dr. Love kidnapped Bones and the other newborns and raised them in an isolated
desert retreat in northern California, telling the children that they had been
abandoned. After Dr. Love's death, inspired by reports of the JSA (and the group's
inheritors, Infinity Inc.), Bones and the other children left the retreat and formed their
own superhero group, Helix. The misguided team quickly turned to crime but were
stopped by Infinity Inc.

Bones was released into Infinity's custody, where he served as an unofficial
member until the group disbanded following the death of Sylvester Pemberton (the
original Star Spangled Kid), who died when Solomon Grundy forced him into
contact with Bones' "cynaide touch." Although not directly responsible, Bones is still
plagued with guilt over Pemberton's death.

Bones disappeared for a short time after Infinity's dissolution, re-emerging as a key
player in the government agency called the D.E.O. (Department of Extranormal
Operations). Now the agency's Director (under Secretary of Metahuman Affairs,
Amanda Waller) it is unknown how Bones joined the organization and how he will use
it for (or against) the JSA.

From JSA Secret Files and Origins #2