今年67岁的李某与罗某结婚多年，两人常因琐事吵架打架。1985年儿子的出生让李某十分开心，期间夫妻关系得到缓解。等到儿子上初中后，李某发现学生牌上儿子标注的血型是O型，自己却是B型，依照自己干过赤脚医生的经验，加上之前听过妻子的流言蜚语，便固执的认为妻子与他人有不正当的男女关系，经常找罗某的麻烦，并时常对妻子拳脚相向，两人关系逐渐恶化。2006年，儿子体检当兵，儿子的血型再一次刺痛李某内心，李某变本加厉恶打妻子，甚至要求妻子赔偿自己20万并且离婚。2008年12月份，夫妻俩和儿子来到长沙鉴定机构做亲子鉴定，结论证实儿子是两人的亲生儿子，但固执的李某认为是妻子买通关系造假出来的结果，两人关系更加恶化。罗某住儿女家，李某住自己家并与其他茶楼女子发生关系，双方到了水火不容的地步。

直到今年8月份，女儿打电话给李某叫父亲帮忙带外孙，李某误认为妻子罗某只愿意带孙子，当时就在电话里扬言要将罗某杀害。8月31日晚上8时许，两人同在儿子家中，李某将衣裤打包准备离开，出门时返身对罗某说了一句：“明日把婚离了”。罗某反应他一句：“某某在等你啊。”这话激怒了李某，立马走到罗某面前用脚将她踢倒。爬起后的罗某仍然骂，李某用右手使劲朝罗某的嘴巴上打了一拳，手都打伤了。罗某继续破口大骂，李某撂出狠话：“你还整日骂，老子今天搞死你算了。”罗某并没有收声，发火的李某到厨房拿了一把刀，在争执过程中逐渐将罗某杀倒在地，罗某流血不止，在未死的情况下，李某贸然将房门反锁径直离去。因错过最佳抢救时间，罗某死亡。

当晚23时许，有人将这一情况报至公安局，李某当日主动向公安机关投案。

检察官提醒：解析本案，一是夫妻之间出现信任危机，二是家庭暴力升级，三是粗暴语言攻击共同导致了一次争吵演变成了最后的凶杀。俗话说“一日夫妻百日恩，百日夫妻似海深”，同一屋檐下的夫妻难免会发生摩擦，应该心平气和去沟通交流，避免因冲动而犯罪。

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Paternity Determination by Blood Type

Blood type can be used to disprove paternity in many cases.

The ABO blood type charts below can be used to predict the possibilities of paternity.

The charts below can assist you to determine either:

　　　 1. The ABO blood type of the child when the blood type of the father and the mother are known (top chart), or

　　　 2. The ABO blood type of the father if the blood type of the child and the mother are known (bottom chart).

ABO Blood Type Calculator

ABO blood types can be complicated to understand. This is mostly due to the fact that the　'O-type' antigen is masked by the presence of an A- or B-type antigen.　This is explained in the following chart, showing the different the genotypes that make up the blood types.

For example, two O blood type parents can produce a child with only O blood type. Two parents with A blood type can produce a child with either A or O blood types. Two parents with B blood type can produce a child with either B or O blood type. One parent with A and another with B can produce a child with A, B, AB or O blood types. If one parent has A and another has AB, they can either produce a child with A, B or AB blood types. If one parent has A and another has O, they can either produce a child with A or O blood types.

Rh Positive (Rh+) and Negative (Rh-) Blood Types

The Rh (+/-) factor is inherited separately from the ABO blood types. Similarly to the masking effect of the O gene in ABO blood types, the Rh negative (Rh-) gene is also masked by the presence of a Rh positive (Rh+) genotype. Therefore, a person may have a Rh + blood type and can still have an Rh - gene (See the chart below). Furthermore, 2 parents with Rh + blood types can have a child with Rh - blood type.

via　http://www.canadiancrc.com/paternity_determination_blood_type.aspx