A German nurse admitted in court on Tuesday to being post-war Germany's deadliest serial killer, murdering 100 patients with lethal injections so that he could play the hero by trying to revive them.
Presiding Judge Sebastian Bührmann asked Hoegel if the charges against him were true, to which he responded "Yes", DW reported.
"What I have admitted took place", the 41-year-old added.
According to prosecutors, his motive was to impress colleagues by resuscitating the very patients he had attacked.
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At his second trial in 2014-2015, he was sentenced to life in prison without the possibility of parole on six convictions-two murder charges, three attempted murder charges, and one charge of unsafe bodily assault.
More than 120 relatives of the victims are co-plaintiffs in the trial, which could last until May.
In general, people serving life sentences are considered for parole after 15 years.
The hospital in Oldenburg dismissed Hoegel in late 2002 due to mounting suspicions about the deaths of patients on his watch.
Each time, the nurse followed a similar procedure; he would inject his patient with a medication triggering a cardiac arrest, which would follow an attempted resuscitation.More news: The 'solar' roof on your Kia will soon charge your auto
The choice of victim appears to have been entirely random, with their ages ranging from 34 to 96. "We fought for four years for this trial and expect HÃ¶gel is sentenced for another 100 murders", said Mr Marbach, whose grandfather was killed by HÃ¶gel.
The bearded, heavyset Hoegel took his seat in the courtroom wearing a hoodie and covered his face with a folder as long as photographers and camera teams were allowed to remain.
Hoegel was first caught in 2005 injecting unprescribed medication into a patient in Delmenhorst.
Oldenburg police chief Johann Kuehme a year ago said other medical workers at Oldenburg were aware of an elevated number of resuscitations, and initial indications of possible wrongdoing by the nurse in Delmenhorst emerged as early as April 2003.
Investigators say that he may have killed even more.More news: Google's new reCAPTCHA learns from you
Investigators say the final toll could top 200 but fear they might never know for sure because the bodies of many possible victims were cremated.