BERLIN — A German prosecutor has filed new murder charges against an admitted Nazi hit man who has avoided jail for nearly six decades despite being convicted in the Netherlands of killing civilians in reprisal for resistance attacks during World War II.

Dortmund prosecutor Ulrich Maass told the Associated Press yesterday that the charges involve the 1944 murders of three Dutch men while Heinrich Boere was a member of a Waffen SS death squad. AP was first to report last month that Mr. Maass had quietly reopened the case by beginning his own investigation of the 86-year-old Mr. Boere.

Mr. Boere has acknowledged involvement in the killings, but describes them as a reality of wartime. He could not be reached for comment yesterday. The old-age home where he lives said he checked himself into a hospital early this week. Though Mr. Boere was sentenced to death in absentia by a Dutch court in 1949, later commuted to life imprisonment, German courts have blocked attempts to extradite him or enforce the verdict here. Mr. Maass will now seek a German trial for Mr. Boere.

“It’s high time that this happened, and I’m very pleased that the German prosecutors have finally moved against Boere,” the Simon Wiesenthal Center’s chief Nazi hunter, Efraim Zuroff, said in a telephone interview from Jerusalem.