Let's recap what's known:
Jaradat was a healthy 29 year old man when he was abducted/arrested by Israeli authorizes on February 18. (He turned 30 while in Israeli custody)
On Feb. 22, Jaradat was in an Israeli court where his lawyer who made this statement:
"I saw Jaradat sitting on a wooden chair in front of the judge. His back was hunched and he looked sick and fragile. When I sat next to him he told me that he had serious pains in his back and other parts of his body because he was being beaten up and hanged for many long hours while he was being investigated"
Arafat Jaradat died on February 23 (the next day). Israeli authorities at the prison claimed Jaradat died of a heart attack.
An Israel pathologist performed an autopsy on Jaradat's body on February 24 at the Abu Kabir Forensic Institute in the presence of a Palestinian pathologist, several family members and a legal team from the Palestinian Authority's Prisoner Affairs office.
The Israeli pathologist in charge of the autopsy reported no evidence supporting claims Jaradat died of a heart attack. They only reported minor injuries (two broken ribs and bruising) which could be consistent with attempts to revive Jaradat.
The Palestinian pathologist claims he also saw no evidence Jaradat died of a heart attack. However he claimed he saw injuries consistent with a severe beating. (six broken bones in Jaradat's neck, spine, arms and legs. Severe bruises on the back, chest, face and inside the mouth)
The UN and the Palestinian Authority have asked for an independent inquiry into the Jaradat's death. Israel has refused so far.
BTW, in 2000, a declassified official Israeli report acknowledged the Israeli security service tortured detainees during the Palestinian uprising, the Intifada, between 1988 and 1992.
BBC News | MIDDLE EAST | Israel admits torture
Amnesty International and other human rights groups have consistently reported that Israelis tortures and abuses Palestinians during interrogation.