A Yemeni staff member of Action Against Hunger was killed by shrapnel on the roof of her home in the embattled city of Hodeidah, the aid group said Tuesday.
The Yemeni woman, whom Action Against Hunger identified as "Aamnah", was on the roof of her house with her sister on Monday when they were both hit by shrapnel.
Her sister was wounded and survived, the group said. It described Aamnah's death as "murder" but did not accuse anyone of the attack.
"We learned with deep sadness of Aamnah's death. She was a model of dedication and professionalism within the organisation. Our thoughts are with her family, friends and colleagues in Yemen," said Veronique Andrieux, executive director of Action Against Hunger.
Aamnah worked at a diarrhoea treatment centre with and later as a health educator with the New York-based humanitarian group, which specialises in combatting hunger.
The Red Sea province of Hodeidah has witnessed some of the Yemen war's most intense fighting, which has eased since the government and Houthi rebels agreed to a ceasefire in the area in December.
The Iran-linked Houthis have battled the government and its allies in a coalition led by Saudi Arabia and the United Arab Emirates for control of the impoverished country for four years.
Hodeidah has been held by the rebels since 2014.
Around 10,000 people -- mostly civilians -- have been killed and more than 60,000 wounded since Saudi Arabia and its allies joined the conflict in 2015, according to the World Health Organization.
Action Against Hunger put the toll at more than 57,000. Other aid groups have also said the toll could be significantly higher than 10,000.
The Yemen conflict has triggered what the UN calls the world's worst humanitarian crisis, with more than 10 million people at risk of starvation.
Over 24 million Yemenis -- more than three quarters of the country's population -- are now dependent on some form of aid for survival, according to the UN.