继周二下午密歇根州一所高中发生枪击事件后，又有一名学生死亡。

治安官官员称，17岁的贾斯汀·希林(Justin Shilling)于周三上午10点45分左右在牛津镇牛津高中枪击案后死亡。另外三名学生，年龄在14到17岁之间，周二去世。包括一名教师在内的七人受伤。

保罗·桑奇亚/美联社

2011年11月11日，密歇根州牛津市，参加守夜活动的人们在湖心社区教堂拥抱...

奥克兰县检察官凯伦·麦克唐纳在周三的新闻发布会上说，15岁的枪手嫌疑人伊森·奇利被拘留，并被指控为成年人。

奥克兰县治安官迈克尔·布查德周三说，没有迹象表明受害者是特定目标。

埃里克·西尔斯/底特律自由新闻报今日美国网

父母带着孩子从牛津的梅耶尔停车场离开，那里有很多学生.

麦克唐纳说，她有信心检察官能够证明枪击事件是“早在事件发生之前”就有预谋的

一名执法官员告诉美国广播公司新闻，调查人员正在积极寻找信息，周一晚上，数量不明的学生似乎看到了一段Snapchat视频，警告周二发生了枪击事件。这位官员说，一些看到视频的学生没有去学校，而是呆在家里，尽管警方没有接到关于视频的电话。

周三下午，在克莱里第一次出庭时，奥克兰县警长办公室的蒂姆·威利斯中尉证实，从嫌疑人的手机里找到了视频。威利斯说，他们包括了一段在枪击发生前一天晚上由chilley拍摄的视频，据称他在视频中“谈到了第二天在牛津高中枪杀学生的事情。”

调查人员还从奇瑞的背包里找到了一本日记，据称里面详细记录了杀害学生的意图。

据警长办公室称，“嫌疑人在枪击发生的前一天和当天参与了一次关于行为问题的会议。”

“在第一次见面之前，他的学校档案中没有提到任何令人担忧的事情，”警长办公室说。"也没有记录在案的学校欺凌嫌疑人的案例."

奇瑞被指控犯有一项恐怖主义致人死亡罪;四项一级谋杀罪;七项意图谋杀的袭击罪;她说，还有11项持有枪支的重罪指控。麦当劳表示，可能会收取额外费用。

一名法官在审讯中对奇瑞提出无罪抗辩。法官说，他将被转移到奥克兰县监狱，与邦德隔离关押。他下一次出庭定于12月13日。

官员们说，这名少年据称带着他父亲的半自动手枪，一把9毫米西格绍尔手枪去学校。

据称，在周三的提审中，奥克兰县助理检察官马克·凯斯特(Marc Keast)说，就在下午1点前，克里利带着一个背包进入了一个浴室，一两分钟后，他不带背包再次出现，“但手里拿着一把枪”。

据Keast称，据称他走在走廊上，瞄准教室内和附近的学生。

鲍查德说，他从未进过教室，而是在走廊上被捕。

警长说，已经找到30个废弹壳。他说，嫌疑人还剩18发实弹。

据一位了解调查情况的消息人士透露，嫌疑人的父亲在黑色星期五购买了这把武器，官员们正在调查这家人是如何存放枪支的，以及这名青少年有多少机会接触这些枪支。消息人士称，嫌疑人显然在学校枪击事件前使用了这把枪。

麦克唐纳说，检察官正在考虑对嫌疑人的父母提出指控。

在周二的枪击事件中，第一批被杀害的三名学生是17岁的马迪辛·鲍德温、16岁的泰特·迈雷和14岁的哈娜·圣·朱莉安娜。

警长说，七名受伤的受害者中有四人周三仍在医院。他说，医院里有一名17岁的女孩，她胸部中弹，情况危急。

在周三晚上发布的一份声明中，牛津社区学校区表示，该社区“遭受了不可估量的损失。”

该地区表示，它正在“全面参与”警长办公室的调查，并警告称，在袭击发生后，不要进行“重大猜测和错误信息”。

该区表示:“执法部门已经并将继续分享经核实的事实。

4th student dies from Michigan school shooting; 15-year-old charged as adult: Latest

A fourth student has died following Tuesday afternoon's shooting at a Michigan high school.

Justin Shilling, 17, died at about 10:45 a.m. Wednesday in the wake of the shooting at Oxford High School in Oxford Township, sheriff's officials said.Three other students, ages 14 to 17, died Tuesday. Seven people, including a teacher, were injured.

The suspected gunman, 15-year-old Ethan Crumbley, was taken into custody and is being charged as an adult, Oakland County Prosecutor Karen McDonald said at a news conference Wednesday.

There's no indication that the victims were specifically targeted, Oakland County Sheriff Michael Bouchard said Wednesday.

McDonald said she is confident prosecutors can prove the shooting was premeditated "well before the incident."

A law enforcement official told ABC News that investigators are actively pursuing information that, Monday night, an undetermined number of students appeared to see a Snapchat video warning of a shooting on Tuesday. Some students who saw the video stayed home from school, though no calls were placed to police regarding the video, the official said.

During Crumbley's first court appearance Wednesday afternoon, Lt. Tim Willis of the Oakland County Sheriff's Office confirmed that videos were recovered from the suspect's phone. Willis said they included one video by Crumbley the night before the shooting in which he allegedly "talked about shooting and killing students the next day at Oxford High School."

Investigators also recovered a journal from Crumbley's backpack that allegedly detailed a desire to kill students.

According to the sheriff's office, "the suspect had been involved in a meeting over behavior issues the prior day and the day of the shooting."

"Nothing of concern was noted in his school file prior to the first meeting," the sheriff's office said. "There are also no documented cases of bullying of the suspect with the school."

Crumbley has been charged with one count of terrorism causing death; four counts of first-degree murder; seven counts of assault with intent to murder; and 11 counts of possession of a firearm in commission of a felony, she said. Additional charges are possible, McDonald said.

A judge entered a not guilty plea for Crumbley at his arraignment. He will be moved to Oakland County Jail and held in isolation with bond, the judge said. His next court appearance is scheduled for Dec. 13.

The teen allegedly took his father's semiautomatic handgun, a 9 mm Sig Sauer pistol, with him to school, officials said.

Crumbley allegedly entered a bathroom just before 1 p.m. with a backpack and reemerged a minute or two later without the bag "but with a gun in hand," Oakland County Assistant Prosecuting Attorney Marc Keast said during Wednesday's arraignment.

He allegedly walked down the hallway, aiming inside classrooms and at nearby students, according to Keast.

He never went into a classroom and was apprehended in a hallway, Bouchard said.

Thirty spent shell casings have been recovered, the sheriff said. The suspect had 18 live rounds left, he said.

The suspect's father purchased the weapon on Black Friday and officials are looking into how the family stored its guns and how much access the teen had to them, according to a source briefed on the investigation.The suspect had apparently used the gun prior to the school shooting, the source said.

McDonald said prosecutors are considering charges against both of the suspect's parents.

The first three students killed in the Tuesday shooting were Madisyn Baldwin, 17, Tate Myre, 16, and Hana St. Juliana, 14.

Four of the seven injured victims remained in the hospital on Wednesday, the sheriff said. Among those in the hospital is a 17-year-old girl who is in critical condition with a gunshot wound to the chest, he said.

In a statement released Wednesday evening, the Oxford Community Schools District said the community "has suffered a loss that is immeasurable."

The district said it is "fully participating" in the sheriff's office's investigation and warned against "significant speculation and misinformation" in the wake of the attack.

"The verified facts have been and will continue to be shared by law enforcement," the district said.