Jordanian police say a man is believed to have shot dead his divorced sister after seeing her photograph on his male friend's mobile phone.
The 27-year-old shepherd is said to have surrendered himself shortly after the incident saying he had killed his sister to cleanse his family's honour.
It is the fifth report of a so-called honour killing in Jordan since January.
Under the current laws, men convicted of an honour killing can get jail sentences of as little as six months.
The 31-year-old victim, who has not been identified, was shot
twice in the head at her home in a Palestinian refugee camp in the northern city of Irbid.
Police quoted by Associated Press said the brother began monitoring his sister's activities after seeing her photo on a friend's mobile phone.
He is alleged to have killed her after seeing the man leave her home in Azmi al-Mufti camp on Monday, police said.
The Jordanian government wants to introduce tougher punishments for such crimes, but many MPs from conservative tribal backgrounds are against the proposed changes, arguing that they encourage vice.
In 2004, at least 19 women are believed to have lost their lives in honour killings in Jordan.