He was a German sniper who was stationed at Neuville. His sniping post was in a tower looking down one of the streets. According to Jackson his post was 450 yards away from where they were at the end of the road which caused him to remark that the sniper had talent to shoot someone from that far away.
Sniper Fight in Neuville
A few days after D-day, he noticed some American soldiers trying to help some French citizens. He took aim and shot Carparzo right through the chest. This caused the other Americans to take cover. Unbeknownst to him, Jackson snuck around and took aim behind some rubble as they couldn't help Caparzo without risk of being shot by the German sniper.
The German scanned the area in his scope to see where the other Americans had hidden. By the time his sight found Jackson, it was already too late and he took a direct hit right into his right eye killing him instantly. Even though he died, he still took Caparzo with him as Jackson took too long to kill him leaving Caparzo stranded for too long resulting in him dying of his chest wound.