The driver of a car that fatally struck a 54-year-old woman on a Vespa motor scooter in Newton Thursday identified himself Friday as Detlev Vagts, 81, of Cambridge.
Vagts, a retired Harvard Law School professor, said he got lost driving his wife to the dentist in his 2010 Subaru Legacy when he hit Marcia Kearney on her Vespa.
The Middlesex district attorney’s office identified Kearney, of Northampton, Friday.
Vagts was driving on Ward Street past Grant Avenue when he said Kearney’s helmet and body appeared suddenly in front of the car.
‘‘It was too late to stop; she was making a turn from my right to the left,’’ Vagts said. ‘‘It was really shocking to see her lying there.’’
A spokeswoman for Middlesex District Attorney Gerard T. Leone Jr. said no charges have been filed.