In the process of a suspected triple murder of a family in Starnberg, Upper Bavaria, the two defendants want to remain silent on the allegations.
They announced this at the start of the trial on Monday in front of the Munich II regional court.
According to the indictment, a 21-year-old German is said to have shot his friend and his parents in their house to get his friend's illegal weapons.
His alleged accomplice, a 19-year-old Slovak, is said to have driven him to the crime scene and picked him up again.
He is charged as an accomplice.
The 19-year-old's defense attacked the public prosecutor's office in three opening statements.
This follows "a simple logic" in their indictment, said lawyer Alexander Betz.
"There are four people in a house, one comes out alive, and so the fourth is the murderer."
However, this is only one of the numerous conceivable variants.
There are "several hypotheses of what could have happened on the night of January 10th to 11th, 2021 that are just as plausible, if not more plausible".
The defense even considers the version that the prosecution initially assumed to be possible - namely that the son of the family first killed his parents and then himself.
In any case, complicity on the part of her client cannot be proven.