Sayyiduna al-Bara' bin Azib (may Allah be pleased with him) said: A man came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah! They ask you about kalalah; so what is kalalah?" He (peace and blessings be upon him) said: "The verse revealed in the summer will suffice you." I said to Abu Ishaq: Kalalah is one who dies leaving neither children nor parents. That is how they understood it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الفرائض / 12271