Kevorkian also said that he gave Youk one week to ponder his decision to die.
Dragovic did not give an opinion on how soon Youk would have died from the disease.
Youk's testimony, Kevorkian could have a difficult time proving his intent without testifying himself.
Like Kevorkian's previous patients, Youk initially thought he was going to inject himself with lethal doses.
On Tuesday, Dragovic said that Lou Gehrig's disease had caused Youk's body to deteriorate.
If convicted of first-degree murder in Youk's death, Kevorkian would face life in prison without parole.
Youk had trouble breathing and swallowing properly and would often choke on his saliva.
While prosecutors call Kevorkian a murderer, Thomas Youk's relatives hail him as a humanitarian.
He pointed out to jurors that Kevorkian barely knew Youk 24 hours before he killed him.
Kevorkian said that fact presents reasonable doubt over whether he intended to kill Youk.
He also conceded that while Youk did not die from Lou Gehrig's disease, his death was imminent.
Kevorkian told Wallace that Youk's disease had progressed to the point that he could barely swallow and breathe properly.
During closing arguments Thursday, Kevorkian told jurors that only he knew his true intent when he helped Youk die.
Youk would be able to give jurors insight into her late husband's pain and suffering, but that testimony is inadmissible.
Kevorkian also told Youk of his intent to use him to extend the national debate over assisted suicide to euthanasia.
Kevorkian stressed that prosecutors can only infer his intentions from the videotapes of Youk's death: only he knows the truth.
Skrzynski implied that Kevorkian was only concerned about killing Youk to advance his political agenda, not about the 52-year-old's well-being.
He said he was only doing his duty as a dedicated physician and following Youk's wishes to end his suffering.
Kevorkian also wanted Judge Cooper to admit the testimony of Youk's wife, Melody, claiming that she could testify about his intent.
The doctor also said there was a substance on Youk's arm that appeared to conceal the puncture wounds on his arms.
After the prosecution rested, Kevorkian tried to get pictures of Youk before his battle with Lou Gehrig's disease admitted at trial.
Like Kevorkian's previous patients, Youk initially thought he was going inject himself with lethal doses of drugs by operating an apparatus.
It's too bad that the most important people in this case, Melody and Terrence Youk, were not involved in the trial.
After her husband's death, Melody Youk thanked Kevorkian and said she did not consider his deeds murder, but an act of mercy.
Despite Youk's consent, prosecutors showed that even Kevorkian admitted on the tape that his motives in Youk's death may have been selfish.
Youk, Kevorkian said, was hesitant at first, but agreed to his suggestion.
His defense was shackled by a pretrial ruling that Youk's pain and suffering was only relevant to assisted suicide and not murder.
"Thomas Youk didn't want to die ... no one does, " Kevorkian said.
The medical examiner, who oversaw Youk's autopsy, has said in past that there is no such thing as assisted suicide, that it's murder.
But instead Kevorkian administered the fatal "death potion" to Youk himself, inviting prosecutors to charge him with first-degree murder for the first time.
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