The Annales Sangallenses record that "Adalbert filius Perehctoldi et Arnolfus filius Arnolfi ducis" were killed in 954. He is named as son of Arnulf in 6 Feb 954. He rebelled against Otto I King of Germany in 954, aiming to re-establish his family's position in Bavaria but was killed in the first siege of Regensburg.
The necrology of churches of Freising records the death "XI Kal Aug" of "Arnolt com", which is assumed refers to Pfalzgraf Arnulf.
The name of Arnulf's wife is not known. 1