Someone is harassing my friends and family through GMAIL

Someone hacked into my GMAIlL account and sent messages on my behalf. I changed my password and security question and it happened again. Then I completely deactivated my GMAIL account. Soon after, this person created a gmail account and is now messaging my friends and family. Below is information from their gmail account. If someone could help me figure out where to go/what to do in this case, I would appreciate it. Thank you.

Delivered-To: (REDACTED)
Received: by 10.142.213.12 with SMTP id l12csp226000wfg;
Mon, 25 Jun 2012 13:51:04 -0700 (PDT)
Return-Path: <singhb156@gmail.com>
Received-SPF: pass (google.com: domain of singhb156@gmail.com designates 10.68.200.101 as permitted sender) client-ip=10.68.200.101;
Authentication-Results: mr.google.com; spf=pass (google.com: domain of singhb156@gmail.com designates 10.68.200.101 as permitted sender) smtp.mail=singhb156@gmail.com; dkim=pass header.i=singhb156@gmail.com
Received: from mr.google.com ([10.68.200.101])
by 10.68.200.101 with SMTP id jr5mr28080321pbc.153.1340657464064 (num_hops = 1);
Mon, 25 Jun 2012 13:51:04 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=gmail.com; s=20120113;
h=mime-version:in-reply-to:references:date:message-id:subject:from:to
:content-type;
bh=CosKcSMnPrtMFy5pLSeyRIona5Cf+akSXdYrBP9vpqo=;
b=En968EcCYjwm1hixtrYfbMYRc0RO6szP2liOJtyf9lTIqeFLSipVuxvH62sX2eaqWu
qO27i0IUl5LsDGKg2fB7iVfR0bePLpDlIL6sSd9tCd6DOii64rWgB90/xGqECdZYaKIe
SZd88esXa0yJSasw5UqsIjfFRasJpsKw6eYRGYxZbGLysRyiL+x67wMv4QjOOg4by+6K
k2bacVRdFImHDoitXHuGwvlt1e5e+/83CaDouo6si9B6Sh62gephdo5XulSzgjPuhEV5
jTMDC9LiDgVgCpMtnjsBaKnlJP4TFLpDMl6QrQ6sWRJ9dIZCMiJjM/Gd5vFNyqahi+ew
qhEQ==
MIME-Version: 1.0
Received: by 10.68.200.101 with SMTP id jr5mr28080321pbc.153.1340657464058;
Mon, 25 Jun 2012 13:51:04 -0700 (PDT)
Received: by 10.68.33.7 with HTTP; Mon, 25 Jun 2012 13:51:04 -0700 (PDT)
In-Reply-To: <CAG9zBpEBC6_JAXgCSwky2gV+_292nrR5kfu3XghaRYtg_kDZEQ@mail.gmail.com>
References: <CAG9zBpHGO3q2RxLtqauFVRpMqBRmQv1ZcB3-uJfsoVAO=+YDgw@mail.gmail.com>
<CAC2gGTMNso-=L4ycGeM-E_jHySK0xz6OVPikxduMEdgNyeL6Fw@mail.gmail.com>
<CAG9zBpEBC6_JAXgCSwky2gV+_292nrR5kfu3XghaRYtg_kDZEQ@mail.gmail.com>
Date: Mon, 25 Jun 2012 16:51:04 -0400
Message-ID: <CAG9zBpESKw0AxnTtJpEw=dfqoYZgM6XeQ63z=AO==uVs12EJWw@mail.gmail.com>
Subject: Re:
From: B Singh <singhb156@gmail.com>
To: REDACTED
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