HANAU, Germany (AP) _ A U.S. Army sergeant walked into his wife's hospital room with the severed head of her lover and told her, ''Look, Diane, Glover is here,'' she testified today.

Diane Schap said she had told her husband, Sgt. Stephen Schap, earlier that day she was pregnant with another man's child and he had correctly determined Glover was the father.

Schap, 26, of Baltimore, is charged with premeditated murder in the beheading of Spc. Gregory Glover, 21, of Phoenix.

Glover was stabbed 10 to 15 times before he was decapitated in a telephone booth at Sickles Army Airfield in Fulda on Dec. 7. Schap was arrested after taking his victim's head to his wife's hospital room in a gym bag.

Defense lawyers do not deny Schap killed Glover, but say he exploded in sudden rage that day upon learning his wife was pregnant by another man.

If convicted of premeditated murder, Schap would face automatic life imprisonment.

Mrs. Schap, who was visibly pregnant, told the seven-man jury at the U.S. Army's Pioneer base in Hanau that her husband entered her hospital room, carrying the victim's severed head in both hands.

''Look, Diane, Glover's here. He'll sleep with you every night, only you won't sleep at night,'' Mrs. Schap, 26, quoted him as saying. ''He told me: 'I studied, I planned this. I calculated this. I did this for you. I love you.'''

Speaking in a quiet, steady voice and not looking at her husband, Mrs. Schap said she did not tell her husband who her lover was and did not think he would be able to figure out the man's identity. She said she had described the lover only as a mutual friend.

''You know you gave me enough clues, it was easy enough to figure out,'' Mrs. Schap quoted her husband as telling her.

During questioning, Mrs. Schap said she had sex with the victim ''a half- dozen times'' between the end of September and the end of November. She said she began the affair when her husband was away on a training trip and she had seen no future in the marriage. The Schaps were childless.

The defendant looked straight ahead, showing no emotion during his wife's testimony.