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The gate of repentance is wide open for anyone who repents to Allah before they die. If one repents as he is about to die, his repentance will not be accepted. Allah (Exalted be He) states: And of no effect is the repentance of those who continue to do evil deeds until death faces one of them and he says: "Now I repent;" nor of those who die while they are disbelievers. For them We have prepared a painful torment. Allah (Glorified be He) asks His sinful slaves and other people to turn to Him with sincere repentance. Allah shows people that He forgives all sins however many they are, as He (Exalted be He) states: Say: "O ‘Ibâdî (My slaves) who have transgressed against themselves (by committing evil deeds and sins)! Despair not of the Mercy of Allâh: verily, Allâh forgives all sins. Truly He is Oft-Forgiving, Most Merciful. Allah (Exalted be He) states: And He it is Who accepts repentance from His slaves, and forgives sins, and He knows what you do. Allah (Exalted be He) also says: And whoever does evil or wrongs himself but afterwards seeks Allâh’s Forgiveness, he will find Allâh Oft-Forgiving, Most Merciful. (Part No. 24; Page No. 343) It was authentically reported that a killer's repentance is accepted, as it was related in the Two Sahih (authentic) Books of Hadith (i.e. Al-Bukhari and Muslim) that Abu Sa`id (may Allah be pleased with him) said: The Messenger of Allah (peace be upon him) said: There was a man before you who had killed ninety-nine persons and then made an inquiry about the most learned persons of the world (who could show him the way to salvation). He was directed to a monk. He came to him and told him that he had killed ninety-nine persons and asked him whether there was any scope for his repentance to be accepted. He said: No. He killed him also and thus completed one hundred. He then asked about the most learned person of the earth and he was directed to a scholar, and he told him that he had killed one hundred persons and asked him whether there was any scope for his repentance to be accepted. He said: Yes; what stands between you and the repentance? You better go to such and such land; there are people devoted to the worship of Allah, so worship Allah with them, and do not come back to the land of yours since it was an evil land (for you). So he went away and he had hardly covered half the distance when death came to him, and there was a dispute between the angels of mercy and the angels of torment. The angels of mercy said: This man has come as a penitent and remorseful to Allah and the angels of torment said: He has done no good at all. Then there came another angel in the form of a human being in order to decide between them. He said: You measure the land to which he has drawn nearer. They measured it and found him nearer to the land where he intended to go (the land of piety), and so the angels of mercy took possession of him. The wording of this Hadith (Part No. 24; Page No. 344) is as related by Muslim.If a Muslim turns to Allah with sincere repentance, fulfilling the conditions of repentance including abandoning the sin, felling regret for what one did, resolving not to repeat the sin again and returning the rights of those whom were wronged asking them to pardon him, Allah will accept such repentance. Moreover, one should increase one's act's of obedience such as supererogatory prayers, charity, supererogatory fasting and other good deeds so that Allah changes one's sins into good deeds. This He has promised after stressing punishment for those who commit major sins such as polytheism, killing with no just cause, and adultery, excluding those who repent of such major sins. Allah (Exalted be He) states: Except those who repent and believe (in Islâmic Monotheism), and do righteous deeds; for those, Allâh will change their sins into good deeds, and Allâh is Oft-Forgiving, Most Merciful. May Allah guide you to turn to Him with sincere repentance!May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.